Fluorite

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Fluorite
3192M-fluorite1.jpg
Deep green isolated fluorite crystal shawin cubic an octahedral faces, set on a micaceous matrix, frae 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 Colourless, white, purpie, blae, green, yellae, orange, reid, pink, broun, blaeish black; commonly zoned; can be ony colour o the spectrum.
Crystal habit Occurs as weel-formed coarse sized crystals an 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 Brickle
Mohs scale hairdness 4 (definin mineral)
Luster Vitreous
Streak White
Diaphaneity Skyre tae leamin
Specific gravity 3.175–3.184; tae 3.56 gif heich in rare-yird elements
Optical properties Isotropic; waik anomalous anisotropism
Refractive index 1.433–1.448
Fusibility 3
Ither characteristics whiles phosphoresces whan heatit or scartit. Ither varieties fluoresce
References [1][2][3][4]

Fluorite (forbye 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 arenae 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 is a soorce o fluoride for hydrofluoric acid manufactur, that 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, makkin thaim valuable in microscopes an telescopes. Fluorite optics can be uised in the far-ultraviolet range an aw, whaur conventional glesses is too absorbent tae uise.

References[eedit | eedit soorce]

  1. Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W. and Nichols, Monte C. (ed.). "Fluorite". Handbook of Mineralogy (PDF). 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