Fluorite

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Fluorite
3192M-fluorite1.jpg
Deep green isolated fluorite crystal showing cubic and octahedral faces, set upon a micaceous matrix, from Erongo Mountain, Erongo Region, Namibia (overall size: 50 mm x 27 mm, crystal size: 19 mm wide, 30 g)
General
Category Halide mineral
Formula
(repeating unit)
CaF2
Strunz classification 03.AB.25
Crystal symmetry Isometric H–M Symbol 4/m 3 2/m
Unit cell a = 5.4626 Å; Z=4
Identification
Color Colorless, white, purpie, blue, green, yellae, orange, reid, pink, broun, bluish black; commonly zoned; can be ony colour o the spectrum.
Crystal habit Occurs as well-formed coarse sized crystals an aa nodular, botryoidal, rarely columnar or fibrous; granular, massive
Crystal seestem Isometric, cF12, SpaceGroup Fm3m, No. 225
Twinnin Common on {111}, interpenetrant, flattened
Cleavage Octahedral, perfect on {111}, pairtin on {011}
Fractur Subconchoidal tae uneven
Tenacity Brittle
Mohs scale hairdness 4 (definin mineral)
Luster Vitreous
Streak White
Diaphaneity Transparent tae translucent
Specific gravity 3.175–3.184; tae 3.56 if heich in rare-yird elements
Optical properties Isotropic; weak anomalous anisotropism
Refractive index 1.433–1.448
Fusibility 3
Ither characteristics sometimes phosphoresces when heatit or scratched. Ither varieties fluoresce
References [1][2][3][4]

Fluorite (an aa cried fluorspar) is a halide mineral componed o calcium fluoride, CaF2. It is an isometric mineral wi a cubic habit, tho octahedral an mair complex isometric furms are nae uncommon.

Fluorite is a colourful mineral, baith in veesible an ultraviolet licht, an the stane haes ornamental an lapidary uses. Industrially, fluorite is uised as a flux for smeltin, an in the production o certain glasses an enamels. The purest grades o fluorite are a soorce o fluoride for hydrofluoric acid manufactur, which is the intermediate soorce o maist fluorine-containin fine chemicals. Optically clear transparent fluorite lenses hae law dispersion, so lenses made frae it exhibit less chromatic aberration, makin them valuable in microscopes an telescopes. Fluorite optics are an aa uisable in the far-ultraviolet range whaur conventional glasses are too absorbent for uise.

References[eedit | eedit soorce]

  1. Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W. and Nichols, Monte C. (ed.). "Fluorite" (PDF). Handbook of Mineralogy. III (Halides, Hydroxides, Oxides). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209724. Retrieved December 5, 2011. 
  2. Fluorite. Mindat.org
  3. Fluorite. Webmineral.com
  4. Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, pp. 324–325, 20th ed., ISBN 0-471-80580-7