Visit the Mango Dog Website! A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z Click Here to Return to the Main Page Hackmanite (Sodalite) Halite (see Salt) Luster is vitreous. Transparency: Crystals are transparent to translucent. Crystal System is isometric; 4/m bar 3 2/m Crystal Habits are predominantly cubes and in massive sedimentary beds, but also granular, fibrous and compact. Some crystals show a crystal type called a hopper crystal described above. Cleavage is perfect in three directions forming cubes. Fracture is conchoidal. Specific Gravity is 2.1+ (light) Streak is white. Associated Minerals include other evaporite deposit minerals such as several sulfates, halides and borates. Other Characteristics: Salty taste. Notable Occurrences include Searles Lake, California and Utah in the U.S., Germany, and Mulhouse, France. Best Field Indicators are taste, cleavage and crystal habit Colors: colorless, pink, bluish; rock salt is transparent Hardness: 2 Hambergite Colorless or white. Helps us stick to our beliefs. Fosters idealism, character and truth. Hanksite Luster is vitreous Transparency: Crystals are transparent to translucent. Crystal System is hexagonal; 6/m 2/m 2/m. Crystal Habits include the typical hexagonal dipyramid terminating an hexagonal prism. The pyramids are often truncated by pinacoids. The six faces of the pyramids are aligned with the six faces of the prism. Tabular and twinned crystals are also common. Cleavage is perfect in one direction. Fracture is uneven. Specific Gravity is approximately 2.5 (slightly below average). Streak is white. Other Characteristics: Has a salty taste, a white powdery film will often cloud crystals and some specimens are fluorescent yellowish-white under longwave ultraviolet light. Associated Minerals are halite, borax, trona, nahcolite, tincalconite and other evaporite minerals. Notable Occurrences include the type locality of Searles Lake, San Bernardino County as well as Mono Lake, Mono County, California and other evaporite locations. Best Field Indicators include crystal habit, taste, occurrences and associations. Colors: colorless, white, gray, green or yellow; rarely black Hardness: 3 to 3.5 Hardystonite Luster is vitreous to dull. Transparency: Specimens are translucent to opaque, rarely transparent. Crystal System is tetragonal. Crystal Habits include massive and granular specimens. Cleavage is perfect in two directions and fair in two other directions (all prismatic). Specific Gravity is approximately 3.4+ (above average) Streak is white. Other Characteristics: Fluoresces a dark violet to blue color under short-wave UV light and no fluorescence under long-wave UV light. Associated Minerals include willemite, esperite, zincite, franklinite, calcite and especially clinohedrite. Notable Occurrence is limited to its type locality: North Hill Mine, Franklin, Sussex County, New Jersey, USA. Best Field Indicators are fluorescence, associations, locality and cleavage. Colors: white to less commonly pale pink or brown Hardness: 3 to 4 Harmotone Luster is vitreous. Transparency: Crystals are transparent to translucent, often milky. Crystal System is monoclinic; 2/m Crystal Habits include a classic penetration twinned crystal that is seemingly composed of three prismatic crystals growing through each other at near 90 degree angles. Although examples showing a perfectly formed twin crystal are scarce, twinning is wide spread and almost all crystals of harmotome are twinned. Aggregates can be radiating and columnar. Cleavage is poor in one direction. Fracture is conchoidal to uneven. Specific Gravity is approximately 2.4 - 2.5 (light, but heavier than most zeolites). Streak is white. Associated Minerals are quartz, heulandite, stilbite, pyrite, brewsterite, edingtonite, barite and other barium and some manganese minerals. Notable Occurrences include several localities in Germany also found at Kongsberg, Norway; Strontian, Highland, Scotland; Wales, Westchester Co., New York, USA and in other localities around the world. Best Field Indicators are crystal habit, twinning, density, hardness and associations. Colors: colorless, white and yellowish Hardness: 4.5 Hauynite A transparent blue. Helps us gain respect, honor, esteem and admiration. Hedenbergite Luster is vitreous to dull. Transparency crystals are translucent to opaque. Crystal System is monoclinic; 2/m Crystal Habits include short prismatic (with a square cross section) and accicular, rarely fibrous crystals. Good crystals are rare, more commonly compact, granular, lamellar and massive. Cleavage is perfect in two lengthwise directions at close to right angles and a basal parting direction is sometimes seen. Fracture is uneven to conchoidal. Specific Gravity is approximately 3.2 - 3.6 (above average) Streak is white to pale green. Associated Minerals are wollastonite, grossular, andradite, magnetite, actinolite, galena, rhodonite and calcite. Notable Occurrences include Fresno Co., California and Franklin New Jersey, USA; Nordmark Sweden; Broken Hill, Australia and Elba and Tuscany, Italy and Kazakhstan. Best Field Indicators are crystal habit, associations, color, fracture and cleavage. Colors: black, greenish black, dark green and dark brown Hardness: 5 to 6 Hedyphane Luster is greasy to resinous. Transparency: Crystals are translucent to transparent. Crystal System is hexagonal; 6 2 2 Crystal Habits include generally massive or granular habits. Cleavage is poor in several directions, but rarely seen. Fracture is uneven. Specific Gravity is approximately 5.8 - 5.9 (rather heavy for translucent minerals) Streak is white. Associated Minerals are richterite, aegirine, hematite, svabite and tilasite. Other Characteristics: Index of refraction is 1.95 (typically high for lead minerals). Notable Occurrences include the type locality at Langban Mine, Filipstad, Varmland, Sweden and other Varmland mines. Best Field Indicators are crystal habit, density, luster, color and locality. Colors: white, gray, bluish or yellowish, but can also be red-violet and green Hardness: 4.5 Heliodor The light green or yellowish-green transparent heliodor has a stimulating effect on the solar plexus chakra. Colors: this is a variety of beryl that ranges from blue-green to yellow Hardness: 7.5 to 8 Heliotrope This stone is used to combat inflammation. Is also an excellent stone for the heart. It cleanses and fortifies blood-carrying organs such as the liver, kidneys, lungs, and spleen. Heliotrope works well on the heart chakra. Colors: opaque dark green with pink, orange and red spots, strikes Hardness: 7 Hematite This stone has grounding and healing properties. It is heavy, solid and silvery black. To the ancients, "hematite" was not what we currently call hematite, but instead what we have come to call bloodstone -- so all ancient referrals to hematite actually refer to bloodstone. Hematite possess the curious property of healing itself. Hematite is known as a "stone for the mind". It brings mental organization and is very grounding and calming. It helps with original thinking, logical thinking, and mathematics. It decreases negativity and can help balance the body/mind/spirit. When in the presence of a myriad of crystals with fluctuating and unwanted energetic effect, this stone will help ground you and neutralize any negative effects being perceived. Hematite is exceptionally good at grounding out excess energy and acting as a stabilizing force. Many people use Hematite as a basis for other stones and crystals, or in cleansing/purifying activities in regard to other stones and crystals. Luster is metallic or dull in earthy and oolitic forms. Transparency: Crystals are opaque. Crystal System is trigonal; bar 3 2/m Crystal Habits include tabular crystals of varying thickness sometimes twinned, micaceous (specular), botryoidal and massive. also earthy or oolitic. Cleavage is absent however there is a parting on two planes. Fracture is uneven. Specific Gravity is 5.3 (slightly above average for metallic minerals) Streak is blood red to brownish red for earthy forms. Associated Minerals include jasper (a variety of quartz) in banded iron formations (BIF or Tiger Iron), dipyramidal quartz, rutile, and pyrite among others. Notable Occurrences especially nice specimens come from England, Mexico, Brazil, Australia and the Lake Superior region. Best Field Indicators are crystal habit, streak and hardness. Colors: gray-black, dark reddish-brown, shiny metallic Hardness: 5.5 to 6.5 Hemimorphite Hemimorphite is a stone that helps one attain a positive self-image including self-esteem and self-respect. It assists in personal growth on all levels, and helps one evolve and transform in healthy ways. Hemimorphite is a stone that bring joy and creativity to one's life. Hemimorphite is sometimes used for protection from malice and poisoning. Additionally, hemimorphite brings good fortune and good luck. Physically, hemimorphite is great for general healing purposes and is especially helpful with pain relief. Hemimorphite is associated with the heart chakra. Luster is vitreous in large crystals to dull in more compact forms. Transparency crystals are transparent to translucent. Crystal System is orthorhombic; mm2 Crystal Habits include the bladed crystal form and the botryoidal form as the most common. The crystals are usually elongated and flat. The terminations are different at each end. One termination is blunted by a pedion face that is usually bevelled by several dome faces. The other end is pointed, being capped by a pyramid. The other common form is botryoidal producing a grape bunch texture. Often the botryoidal form has a cock's comb appearance showing rough crystal terminations. Cleavage is perfect in one direction. Fracture is conchoidal to subconchoidal. Specific Gravity is approximately 3.4+ (above average) Streak is white. Associated Minerals include limonite, aurichalcite, calcite and smithsonite. Other Characteristics: strongly pyroelectric and piezoelectric. Notable Occurrences include Santa Eulalia and Mapimi, Mexico; New Mexico and New Jersey, USA: England and Zambia. Best Field Indicators are crystal habit, color, density and luster. Colors: blue-green, green, white, colorless, brown and yellow Hardness: 4.5 to 5 Herderite Herderite is used in the treatment of behavioral problems. It is a good choice of stone to promote the leader within. It also allows us to be leaders in group settings by bringing harmony and cooperation into group settings. It may also be used for psychic work and to help us develop passion. Luster is vitreous. Transparency: Specimens are transparent to translucent. Crystal System is monoclinic; 2/m Crystal Habits include prismatic crystals with a complex, but over all domal termination. The prism faces may be rounded and etched. Twinning is common forming cyclic twins that have a malformed hexagonal tabular crystal. The "malformation" usually results in a crystal that looks more orthorhombic than hexagonal and are easily confused with crystals of barite. Other types of twinning can form "fishtail" twins similar to gypsum's famous twins. Also found in nodules, fibrous aggregates, radiating clusters and small grains. Cleavage is indistinct in two directions (prismatic). Fracture is subconchoidal. Specific Gravity is approximately 2.9 - 3.0 (average) Streak is white. Other Characteristics: Thermoluminescent, meaning it may glow with a weak blue light upon extreme heating (but this test may damage the specimen). Also sometimes fluorescent, showing deep blue in longwave ultraviolet light. Associated Minerals include those minerals common to phosphatic grantite pegamtites. Notable Occurrences include Golconda Mine, Minas Gerais, Brazil; several locations in Germany and Mursinsk, Russia. It the United States there are several locations that produce plentiful supplies of good crystals such as Newry, Stoneham and Topsham, Maine; Fletcher Mine, Alexandria, New Hampshire and San Diego County, California. Best Field Indicators are crystal habit, color, fluorescence if seen, hardness and localities. Colors: colorless, white, yellowish or pale green to blue-green Hardness: 5 to 5.5 Herkimer Diamond Herkimer Diamonds have been used facilitate lucid dreaming, remembering dreams & entering higher states of consciousness. They are also used for relaxation, acceptance of self, and calming old fears They are commonly used to assist with clairvoyance and clairaudience. Colors: grey-white to translucent Hardness: 7 Hessite Luster is metallic. Transparency: Crystals are opaque. Crystal System: Monoclinic; 2. Crystal Habits include pseudo-cubic to prismatic crystals; fibrous and massive forms are also known. Cleavage: Indistinct in one direction. Fracture: Uneven. Specific Gravity is 8.2 - 8.3 (much heavier than average for metallic minerals) Streak is gray. Other Characteristics: Specimens are sectile. Associated Minerals include gold, quartz, altaite, petzite, sylvanite, chlorargyrite, chlorite, keystoneite, silver, tellurium, coloradoite, thalcusite, tetradymite, sphalerite, chalcopyrite, pyrite, galena and other sulfides. Notable Occurrences include the type locality of Sacaramb (nagyag), Transylvania, Romania as well as San Sebastian and Jalisco, Mexico; Zavodinsk Mine, Altai Mountains, Kazakhstan; Mont Saint-Hilaire, Quebec, Canada and in the United States: Tierra Blanca, Sierra County, New Mexico; Calaveras, Nevada; Cash Mine, Boulder County and Cripple Creek, Colorado; Ross Hannibal Mine, Lawrence County, South Dakota; Tombstone, Arizona; the McAlpine Mine, Tuolumne County and Carson Hill, Calaveras County, California; Eureka Standard Mine, Utah County, Utah and the Flambeau Copper Mine, Ladysmith, Wisconsin. Best Field Indicators are crystal habit, locality, color, sectility, lack of good cleavage, softness and density. Colors: steel gray to lead gray Hardness: 1.5 to 2 Hessonite Clears negativity, eliminates feelings of inferiority, and promotes positive change. Hessonite Garnet is a "stone of creativity." Used on the third chakra, Hessonite will stimulate creativity on all levels. This stone can be used to encourage self-respect, respect of others, and spiritual growth. Hessonite also allows us to release outworn or unusable ideas, views, agreements, and behavioral patterns which we have out grown. On the physical level, Hessonite is used to regulate hormone production, stimulates metabolism, fortifies the immune system, and encourages absorption of nutrients. Colors: various shades of brown and orange Hardness: 6.5 to 7 Heulandite This stone is very helpful with past life recall, weight loss, keeping an open mind, and helping one deal with loss. Heulandite is in the zeolites family of minerals and has been grown aboard the space shuttle. Heulandite is a stone that promotes receptiveness especially in difficult situations. As a psychic tool, heulandite is used for past-life recall. Physically, heulandite can assist with weight loss, balance, and inner ear problems, foot issues, and respiration. Heulandite is considered to be associated primarily with the crown chakra. Luster is vitreous to pearly on the most prominent pinacoid face and on cleavage surfaces. Transparency: Crystals are transparent but most commonly translucent. Crystal System is monoclinic; 2/m Crystal Habits include blocky crystals described as diamond-shaped, trapezoidal and old fashioned coffin shape with the two faces of a pinacoid usually prominent. Crystals are often modified by secondary faces with pairs of triangular faces very common. Prismatic and acicular forms are also known and are difficult to identify as heulandite. In aggregate specimens this face can be oriented upward producing a crust of curved pearly faces or it can be oriented to the side where the tops of the crystals jut out like the roof tops of a suburban community. Crystals can be simple or complexly modified by a variety of prism and pinacoid faces. Cleavage is perfect in one direction parallel to the prominent pinacoid face. Fracture is uneven. Specific Gravity is approximately 2.1 - 2.3 (very light due to the open channels and high water content). Streak is white. Associated Minerals are extensive and include quartz, calcite, apophyllite, barite, pyrite, prehnite, pollucite, tourmaline, scolecite, analcime, chabazite, ferrierite, mordenite, laumontite, natrolite, stilbite and other zeolites. Notable Occurrences are wide spread and include Poona and Nasik Districts, India; Iceland; New Jersey; Washington; Boron, California; Patterson, New Jersey; Arizona and Oregon, USA; Nova Scotia and Quebec, Canada; Iran; Sardinia, Italy; Rio Grande do Sul and Goias, Brazil; New South Wales and Phillip Island, Victoria, Australia; New Zealand; Kola Peninsula, Russia; Scotland and Rhone Valley, Switzerland. Best Field Indicators are crystal habit, density, cleavage, luster and associations. Colors: colorless, white, gray, green, pink, yellow, red, brown and black Hardness: 3.5 to 4 Hiddenite Hiddenite is the green variety of spodumene, and kunzite is the pink variety. It is a stone that is known best for attracting prosperity. It also is a heart chakra stone that provides protection and support for the emotions. Hiddenite helps relieve loss, particularly in the areas of love or money. It is a very calming stone, and helps engender compassion for others. It also brings trust to relationships of all kinds. Psychically, it is said to help connect with other worlds and help transfer knowledge from them and bring insight. It also stimulates the intellect. Physically it is helpful for helping regain youthful-type vigor, skin issues, and circulation, plus any diseases from repressed emotions. Colors: light to dark green, translucent Hardness: 6 Hilairite Luster is vitreous to waxy. Transparency: crystals are transparent to translucent and opaque. Crystal System is trigonal; bar 3 2/m Crystal Habits include small prismatic (three or six sided) crystals with rhombohedral terminations. Twinning is common and crystals are found doubly terminated. Cleavage is not observed. Fracture is conchoidal. Specific Gravity is 2.72 - 2.74 (average) Streak is white. Associated Minerals are gaidonnayite, mangan-neptunite, nenadkevichite, quartz, microcline, albite, calcite, pyrite, galena, sphalerite, polylithionite, rhodochrosite, elpidite, catapleiite, chlorite, goethite, epididymite, zircon, analcime, natrolite, fluorite, eudialyte, ancylite and aegirine. Notable Occurrence is limited to Mont Saint-Hilaire, Quebec, Canada. Best Field Indicators: crystal habit, color, luster and locality. Colors: bronze yellow or dark brown to pink Hardness: 4 Hinsdalite Luster is vitreous to greasy. Transparency: Specimens are mostly translucent to small crystals being transparent. Crystal System is trigonal. Crystal Habits include pseudocubic and pseudotetragonal rhombohedrons and modified rhombohedrons. Clusters of spherical flakes and tablets are known. Faces tend to be curved and striated. Granular or massive formations are also seen. Cleavage is perfect in one direction (basal). Fracture: Uneven. Specific Gravity is approximately 3.7 (above average for non-metallic minerals). Streak is white. Associated Minerals include chalcocite, galena, pyrite, sphalerite, covelite, bornite, pyrophyllite and quartz. Notable Occurrences are limited to the type locality at the Golden Fleece Mine, Lake City, Hinsdale County (hence the name), Colorado as well as locations at Butte, Montana; Ithaca Peak Mine, Mohave County, Arizona and Slate Mountain, El Dorado County, California, USA. Best Field Indicators are crystal habit, color, hardness, density and locality. Colors: yellow, golden-yellow, greenish yellow, green to colorless Hardness: 4.5 Hodgkinsonite Luster is vitreous. Transparency: Specimens are transparent to translucent. Crystal System is monoclinic; 2/m. Crystal Habits include blocky to stubby prismatic crystals. Microcrystals display a acutely sharp pyramidal crystal form. Also massive and vein filling. Cleavage is perfect in one direction (basal). Specific Gravity is approximately 3.9 (above average) Streak is white. Other Characteristics: Does not fluoresce often, but some specimens have shown a red fluorescence under longwave UV light. Associated Minerals include barite, willemite, zincite, tephroite, pyrochroite, spessartine, copper, franklinite, calcite and descloizite. Notable Occurrences are limited to its type locality: Franklin and Sterling Hill, New Jersey, USA. Best Field Indicators are locality, color, crystal habit, cleavage and associations. Colors: lavender, violet, pink, brown, yellow, orange Hardness: 4.5 to 5 Holey Stones (Odin Stones) These are stones with naturally occurring holes produced by erosion or other natural forces. These stones promote psychism, health and protection. To assist in healing, charge a holey stone and wear it around your neck. Rocks with holes such as these have long been used for protection. In ancient times, as well as today, they are hung from your bedpost to prevent nightmares. Hopeite Luster is vitreous. Transparency crystals are transparent to more commonly translucent. Crystal System is orthorhombic; 2/m 2/m 2/m Crystal Habits include prismatic crystals with a slightly asymmetrical hexagonal outline. Terminations can have simple dome faces or be more complex. Also druzy clusters and compact masses. Cleavage is perfect in one direction. Specific Gravity is approximately 3.1 (average for translucent minerals) Streak is white. Associated Minerals are lazulite, parahopeite and some secondary zinc ore deposit minerals. Notable Occurrences include Kabwe, Zambia; Salmo, British Columbia, Canada and Altenburg, Belgium. Best Field Indicators are crystal habit, localities, associations with other zinc ores and/or phosphate minerals and translucency. Colors: colorless, white to off-white, yellow or gray Hardness: 3 Howlite Howlite decreases overly critical thinking, selfishness, stress, pain, and rudeness. Aids in memory retention and increases subtlety and tact. It helps bones, teeth, calcium levels and leg cramps. It also heightens creativity. Luster is dull to sub-vitreous (porcelaneous) and earthy. Transparency crystals are opaque to translucent. Crystal System is monoclinic; 2/m Crystal Habits include cauliflower-like nodules and compact sometimes micaceous masses. Crystals are rare, but minute (1mm size) tabular six sided crystals sometimes aggregated into rosettes are found and some nodules will have crystal faces on their surfaces (mostly from Nova Scotia). Cleavage is absent. Fracture is conchoidal to uneven. Specific Gravity is approximately 2.5 - 2.6 (slightly below average) Streak is white. Other Characteristics: Sometimes fluoresces a blue, yellowish white or off white color under shortwave UV light and dissolves in hydrochloric acid solution without bubbling. Associated Minerals include colemanite, ulexite, anhydrite, gypsum, colemanite and clays. Notable Occurrences include Latonville Quarry, Brookville, Windsor (the type locality) and Iona, Nova Scotia; Newfoundland and New Brunswick, Canada; Sterling Borax Mine, Tick Canyon and Lang, Los Angeles County; Gower Gulch, Inyo County and Daggett, San Bernardino County and other borate deposits in California, USA. Best Field Indicators are nodular character, color, solubility in HCl, luster, lack of cleavage and softness. Colors: white with gray to black streaks, web-like markings and blotches Hardness: 3.5 Huebnerite Luster is resinous. Transparency crystals are transparent to translucent. Crystal System is monoclinic; 2/m Crystal Habits include the flat, heavily modified, tabular crystals. The crystals are elongated along the c axis and are generally flattened in the a axis direction. Also as columnar aggregates and lamellar masses. Cleavage is perfect in one direction parallel to the a and c axes. Fracture is uneven. Specific Gravity is approximately 7.0 (heavy even for metallic minerals) Streak is brown or gray. Associated Minerals are quartz, hematite, tourmalines, cassiterite, micas and pyrite. Other Characteristics: crystals striated lengthwise. Notable Occurrences include Nanling Range, China; France; North Carolina, Idaho and Colorado, USA; Russia; Peru; England and Bolivia. Best Field Indicators are crystal habit, color, density, luster and cleavage. Colors: yellow to reddish brown Hardness: 4 to 4.5 Humite Luster is vitreous. Transparency: Crystals are translucent. Crystal System: Orthorhombic; 2/m 2/m 2/m Crystal Habits include small prismatic to rounded crystals, but as is most commonly the case, as embedded grains. Cleavage is poor in one direction, basal. Fracture is subconchoidal. Specific Gravity is 3.2 - 3.3 Streak is white. Associated Minerals include magnetite, diopside, spinel, biotite, serpentine, chondrodite, olivine and calcite. Notable Occurrences are include Monte Somma, Mount Vesuvius, Italy; Paragas, Finland; Varmland, Sweden; Tilly Foster Mine, Brewster, New York, USA and some other localities. Best Field Indicators are color, associations, environment of formation and hardness Colors: yellow, white, brown, or orange Hardness: 6 Hureaulite Luster is vitreous. Transparency: Crystals are transparent to translucent. Crystal System is monoclinic; 2/m Crystal Habits include small prismatic crystals with slanted pinacoidal faces sometimes in radiating clusters. Cleavage is absent. Fracture is uneven. Specific Gravity is approximately 3.2 (slightly above average for translucent minerals) Streak is white. Associated Minerals are elbaite, reddingite, rockbridgeite, phosphoferrite and other secondary phosphates. Notable Occurrences include Mesquitela Quarry, Portugal; Rio Grande do Norte-paraiba, Brazil; Palermo Mine, North Groton, New Hampshire and San Diego, California, USA and from where it gets its name, Hureaux, France. Best Field Indicators are color, locality, associations and crystal habit. Colors: pink, shades of gray, yellow, red, and brown Hardness: 5 Hydroboracite Luster is vitreous to silky. Transparency: Specimens are translucent to transparent. Crystal System is monoclinic. Crystal Habits include acicular or fibrous radiating clusters and finely granular masses. Tiny crystals have a wedge-shaped termination. Cleavage is perfect. Fracture is uneven. Specific Gravity is approximately 2.2 (below average) Streak is white. Associated Minerals are halite, anhydrite, tunellite, colemanite, ulexite and other borates especially borax. Notable Occurrences include the type locality at Lake Inder, Caucasus Mountains in Southwest Asia; Harz Mountains, Germany; the Furnace Creek Formation of Inyo County and the Boron open-pit mine, Kern County, California, USA. Best Field Indicators are crystal habit, associations, locality, luster and density. Colors: colorless, white to brownish Hardness: 2 to 3 Hydromagnesite Luster is silky, vitreous to earthy. Transparency crystals are transparent to translucent. Crystal System is monoclinic; 2/m Crystal Habits include acicular, lathlike and platy crystals. Tiny spherical aggregates called "puffballs" are found attached to artinite crystals. A type of cave formation called "bubbles" which looks like white chewing gum bubbles are quite unique. Also found as concretions, encrustations and massive. Specific Gravity is 2.15 - 2.25 (very light) Cleavage is perfect in one direction and distinct in another. Fracture is uneven. Streak is white. Other Characteristics: Fluorescent green in shortwave UV and bluish white in longwave UV light and crystals can be striated. Associated Minerals include serpentine, artinite, aragonite, calcite, periclase, brucite, pyrrhotite, talc and olivine. Notable Occurrences include Alameda County; New Idria, San Benito County; Fresno County and other localities in California; Staten Island and Long Island, New York; Jewel Cave, South Dakota and the Grand Canyon, Arizona, USA; Soghan Mine, Kerman, Iran; Eastern Pyrenees, France; Mt. Vesuvius, Italy and British Columbia, Canada. Best Field Indicators are crystal habits, associations, softness and density. Colors: colorless to white Hardness: 3.5 Hydroxylapatite Luster is vitreous to greasy and gumdrop. Transparency: Crystals are transparent to translucent. Crystal System is hexagonal; 6/m Crystal Habits include the typical hexagonal prism with the hexagonal pyramid or a pinacoid or both as a termination. Also accicular, granular, reniform and massive. A cryptocrystalline variety is called collophane and can make up a rock type called phosphorite and also can replace fossil fragments. Cleavage is indistinct in one basal direction. Fracture is conchoidal. Specific Gravity is approximately 3.1 - 3.2 (average for translucent minerals) Streak is white. Notable Occurrences include Durango, Mexico; Bancroft, Ontario; Germany and Russia. Best Field Indicators are crystal habit, color, hardness and look. Colors: green, yellow, blue, reddish-brown, and purple Hardness: 5 Hydrozincite Luster is vitreous or pearly to dull or earthy in massive specimens. Transparency crystals are transparent to translucent. Crystal System is monoclinic; 2/m Crystal Habits include massive forms that can be layered, stalactitic, concretionary, fibrous, and encrusting. Crystal are rare, but when found are usually thin, bladed and tapering to a point or in radiating tufts of acicular crystals. Specific Gravity is 3.5 - 3.8+ (above average for non-metallic minerals) Cleavage is perfect in one direction. Fracture is uneven or fibrous. Streak is white. Associated Minerals include sphalerite, limonite, smithsonite, hemimorphite and calcite. Other Characteristics: is fluorescent (blue) in UV light and effervesces easily in cold dilute hydrochloric acid. Notable Occurrences include Iran; England; Austria; Mexico; southwestern USA, and Australia. Best Field Indicators are fluorescence (blue), crystal habits, single plane of cleavage, localities, and reaction to acid. Colors: white or clear, some tinted pale colors are possible Hardness: 2 to 2.5 Hypersthene Luster is vitreous to pearly. Weathered specimens can have a submetallic luster ("bronzite"). Transparency: Crystals are generally translucent and rarely transparent. Crystal System is orthorhombic; 2/m 2/m 2/m Crystal Habits include rare individual crystals that have a stubby prismatic habit. More typically massive or in coarse lamellar or fibrous aggregates. Cleavage is perfect in two directions at nearly 90 degrees. Fracture is uneven. Specific Gravity is approximately 3.4 - 3.9+ (above average for non-metallic minerals) Streak is white. Other Characteristics: Index of refraction is approximately 1.69 - 1.77. Associated Minerals include iron and stony meteorites, olivine, biotite, quartz, feldspars such as labradorite and certain types of garnets such as almandine. Notable Occurrences include the North Creek, New York, USA and Labrador, Canada. Best Field Indicators are color, crystal habit, hardness, cleavage, index of refraction and luster. Colors: gray, brown or green Hardness: 5 to 6 Quick Jump Links: A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

Return to Thunder Healing's Stones and Crystals Main Page