Fluorite

Fluorite
Deep green isolated fluorite crystal shawin cubic an octahedral faces, set on a micaceous matrix, frae Erongo Mountain, Erongo Region, Namibie (overall size: 50 mm x 27 mm, crystal size: 19 mm wide, 30 g)
General
Category	Halide mineral
Formula (repeatin unit)	CaF2
Strunz clessification	03.AB.25
Creestal seestem	Isometric, cF12, SpaceGroup Fm3m, No. 225
Space group	Isometric H–M Symbol 4/m 3 2/m
Unit cell	a = 5.4626 Å; Z=4
Identification
Colour	Colourless, white, purpie, blae, green, yellae, orange, reid, pink, broun, blaeish black; commonly zoned; can be ony colour o the spectrum.
Creestal habit	Occurs as weel-formed coarse sized crystals an nodular, botryoidal, rarely columnar or fibrous; granular, massive
Twinnin	Common on {111}, interpenetrant, flattened
Cleavage	Octahedral, perfect on {111}, pairtin on {011}
Fractur	Subconchoidal tae uneven
Tenacity	Brickle
Mohs scale haurdness	4 (definin mineral)
Skinkle	Vitreous
Streak	White
Diaphaneity	Skyre tae leamin
Speceefic 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 chairacteristics	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 certaint 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, sae 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.