Chemical Formula |
CaF2 |
Composition |
Calcium fluoride |
Color |
Fluorite occurs in all colors, including colorless, white, purple, blue, red, pink, orange, yellow, brown, green, gray, and black. May also be multicolored and banded. |
Streak |
White |
Hardness |
4 |
Crystal System |
Isometric |
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Crystal Forms and Aggregates |
Most commonly octahedrals and cubic; seldom in dodecahedral crystals. Crystals may also be a combination of octahedra and cubes, and dodecahedral growths may also be present, forming complex and interesting crystals. Cleavage marks are present on most crystals. Cleavage fragments from large crystals are also prevalent; in octahedra, the cleavage fragments are flat, triangular shaped pieces, and cubic cleavage fragments are flat, three dimensional rectangles. Crystals frequently form penetration twins, where one cube is intergrown in another ("fluorite twins"). Also occurs as clusters of intergrown cubes, grainy, botryoidal, as spherical balls, and massive.
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Transparency |
Transparent to translucent |
Specific Gravity |
3.0 - 3.3 |
Luster |
Vitreous |
Cleavage |
1, all sides |
Fracture |
Conchoidal |
Tenacity |
Brittle |
Other ID Marks |
Commonly fluorescent in a variety of colors. |
Complex Tests |
Red and green fluorite become phosphorescent if heated higher than 212º F (100º C) |
In Group |
Halides |
Striking Features |
Perfect cleavage, low hardness, and crystal habits |
Environment |
Hydrothermal ore veins, sedimentary deposits, metamorphic environments, and pegmatite dikes.
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Rock Type |
Igneous, Sedimentary, Metamorphic |
Popularity (1-4)
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1 |
Prevalence (1-3)
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1 |
Demand (1-3) |
1 |
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Fluorite is the only mineral for which significant quantities of the important element fluorine can be obtained. Fluorite is also used as a flux in the manufacture of steel and other metals to eliminate impurities. There is a great demand for Fluorite in the optics field, and to meet it synthetic crystals are grown to produce special lenses. It is used in the production of certain glass and enamel.
Ornamental objects have been found carved from Fluorite. It is soft and creates beautiful ornaments if a large enough chunk is found. Fluorite very often occurs in unflawed crystals in beautiful colors, but its softness prevents it from being a gemstone and it is only faceted for collectors. Fluorite is a very popular mineral among collectors, especially those of classic occurrences which can command exorbitant prices.
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Fluorite occurs throughout the world, and is a very common mineral. Only classic and exceptional localities will be listed here. England has produced some of the finest specimens, especially in Weadale, North Pennines, Co. Durham. Green cubic crystals have come from the famous Rogerly Mine in Weardale, and these uniquely exhibit daylight fluorescence, changing to a saturated blue color in sunlight. Other English occurrences in the North Pennines region are Nenthead (Alston Moor District); the Hilton Mine, Scordale; and East Allendale (Allenheads Mine and St. Peters Mine).
Bright blue Fluorite crystals are known from several areas in France. Three particular important localities are Le Burg (Le Burc) and Mont-Roc, both in Tarn, and Le Beix, in Puy-de-Dome. Pink octahedrons, highly valued by collectors, were found in the Alps near the Argentiere Glacier, Mont Blanc, Chamonix, France; and at Göscheneralp, Uri, Switzerland. Fine crystals are also found in Spain in Caravia, Asturias, especially in the Berbes, La Collada, and Villabona areas. In Germany, fine Fluorite has come from the Erzgebirge in Saxony at Frohnau and the Freiberg District.
Excellent Fluorite specimens are well known from Dal'negorsk, Primorskiy Kray, Russia, and these are very highly regarded by collectors. China has become an excellent producer of Fluorite, with notable occurrences at the Yaogangxian mine, Hunan Province; Shangrao (De'An), Jiangxi Province; the Huanggang Mine, Inner Mongolia; and the Shangbao Mine, Hunan Province. Rounded botryoidal balls, a rare form for Fluorite, comes from Mahodari, Nasik District, Maharashtra, India.
In South Africa, excellent deep-green Fluorites were recently discovered in Riemvasmaak, Northern Cape Province. This occurrence has become one of the most popular Fluorite localities in recent times. The Erongo Mountains of Namibia have produced a highly desirable and unique habit of green Fluorite in cuboctahedral form with an "alien eye" appearance.
In South America, excellent Peruvian localities include the Pasto Bueno District, Pallasca Province, Ancash; and the Huanzala Mine, Huallanca District, Huanuco. Mexico has some fine notable Fluorite locations, specifically Naica, Chihuahua; Melchor Muzquiz, Coahuila; and Mapimi and Navidad, Durango. Canada has produced some some fine crystals, in the Rock Candy Mine, Grand Forks, British Columbia. The U.S. also contains numerous fine Fluorite occurrences. Hardin Co., Illinois, has produced more collectible specimens than anywhere in the U.S., and the locations of Rosiclare, Cave In Rock, and the Harris Creek District (Denton and Annabel Lee Mines) are very famous. Other excellent Fluorite deposits are Marion, Crittenden Co., Kentucky; Clay Center, Ottawa Co., Ohio; the Elmwood Mine, Carthage, Smith Co., Tennessee; Grant Co., New Mexico; and Walworth, Wayne Co., New York. Excellent green octahedrons are found in Westmoreland, New Hampshire. Another very important occurrence is the Blanchard Mine, Bingham, Socorro Co., New Mexico.
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Calcite - Slightly softer (3), different crystal forms. Quartz - Much harder (7), no cleavage. Apatite - Harder (5), different crystal form. Halite - Softer (2 - 2½), has a salty taste.
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