Deep green isolated fluorite crystal resembling a truncated octahedron, set upon a micaceous matrix, from Erongo Mountain, Erongo Region, Namibia (overall size: 50 mm × 27 mm, crystal size: 19 mm wide, 30 g)
slightly water soluble and in hot hydrochloric acid
Other characteristics
May be fluorescent, phosphorescent, thermoluminescent, and/or triboluminescent
References
[2][3][4][5]
Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF2. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral and more complex isometric forms are not uncommon.
The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 4 as fluorite.[6]
Pure fluorite is colourless and transparent, both in visible and ultraviolet light, but impurities usually make it a colorful mineral and the stone has ornamental and lapidary uses. Industrially, fluorite is used as a flux for smelting, and in the production of certain glasses and enamels. The purest grades of fluorite are a source of fluoride for hydrofluoric acid manufacture, which is the intermediate source of most fluorine-containing fine chemicals. Optically clear transparent fluorite has anomalous partial dispersion, that is, its refractive index varies with the wavelength of light in a manner that differs from that of commonly used glases, so fluorite is useful in making apochromatic lenses, making it valuable, particularly in photographic optics. Fluorite optics are also usable in the far-ultraviolet and mid-infrared ranges, where conventional glasses are too opaque for use. Fluorite also has low dispersion, and a high refractive index for its density, which can make it useful for some specialized purposes in optics.
^Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (1990). "Fluorite". Handbook of Mineralogy(PDF). Vol. III (Halides, Hydroxides, Oxides). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209724. Archived (PDF) from the original on 2006-09-06. Retrieved December 5, 2011.
^Cite error: The named reference Mindat was invoked but never defined (see the help page).
^Fluorite. Webmineral.com
^Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, pp. 324–325, 20th ed., ISBN 0-471-80580-7
^Tabor, D. (1954). "Mohs's Hardness Scale - A Physical Interpretation". Proc. Phys. Soc. B. 67 (3): 249. Bibcode:1954PPSB...67..249T. doi:10.1088/0370-1301/67/3/310. Retrieved 19 January 2022.
Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF2. It belongs to the halide minerals. It crystallizes in isometric cubic habit...
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fluorite (also called fluorspar), which is often deeply coloured owing to impurities. The compound crystallizes in a cubic motif called the fluorite structure...
the rock salt structure, the fluorite structure (AB2) is also an Fm3m structure but has 1:2 ratio of ions. The anti-fluorite structure is nearly identical...
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Mountain in western Utah and Chivinar in South America. It can be found with fluorite and cassiterite in various areas including the Ural and Ilmensky mountains...
material. For example, if some material is scratched by apatite but not by fluorite, its hardness on the Mohs scale would be between 4 and 5. "Scratching"...
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engineering applications, Schottky defects are important in oxides with Fluorite structure, such as CeO2, cubic ZrO2, UO2, ThO2 and PuO2.[citation needed]...
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structure with highest Z compatible with their ionic radii. Note also how the fluorite structure being intermediate between the caesium chloride and sphalerite...
of special technologies, including ground aspherical surfaces, calcium fluorite optical elements, and ultra-low-dispersion glass. Canon used these means...
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This list of mines in Russia is subsidiary to the list of mines article and lists working, defunct and future mines in the country organized by primary...
pyroemerald, cobra stone, and pyrosmaragd, is a rare variety of the mineral fluorite with the unusual combined properties of thermoluminescence, thermophosphoresence...
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