fluorite$29045$ - ορισμός. Τι είναι το fluorite$29045$
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Τι (ποιος) είναι fluorite$29045$ - ορισμός

MINERAL, CALCIUM FLUORIDE
Fluorspar; Fluor-spar; Fluor spar; Florite; Fluorite lens; Fluor-Spar; Fluorite glass; Fluorospar; Flourite; Night pearl
  • Fluorite on barite from the Berbes mine, Ribadesella, Asturias (Spain).  Fluorite crystal, 2.2 cm.
  • alt=black, chevronned (wavy, jagged) structure
  • Fluorescing fluorite from Boltsburn Mine, [[Weardale]], [[North Pennines]], [[County Durham]], England, UK.
  • access-date=20 December 2014}}</ref> Made of fluorite.
  • The structure of calcium fluoride CaF<sub>2</sub>.<ref>{{Greenwood&Earnshaw2nd}}</ref>

Fluorite         
·noun Calcium fluoride, a mineral of many different colors, white, yellow, purple, green, red, ·etc., often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called fluor spar, or simply fluor.
fluor-spar         
n.
Derbyshire spar, fluoride of calcium.
fluorite         
['fl??r??t, 'fl?:-]
¦ noun a mineral consisting of calcium fluoride which typically occurs as cubic crystals, colourless when pure but often coloured by impurities.

Βικιπαίδεια

Fluorite

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.

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 lenses have low dispersion, so lenses made from it exhibit less chromatic aberration, making them valuable in microscopes and telescopes. Fluorite optics are also usable in the far-ultraviolet and mid-infrared ranges, where conventional glasses are too opaque for use.