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Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF 2. ... but are more difficult to produce and more costly. [37]
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The hardness of a material is measured against the scale by finding the hardest material that the given material can scratch, or the softest material that can scratch the given 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. [8]
Fluorite crystals. Fluorine is estimated to be the 13th-most abundant element in Earth's crust and is widely dispersed in nature, entirely in the form of fluorides. The vast majority is held in mineral deposits, the most commercially important of which is fluorite (CaF 2). [4]
Blue, unbanded fluorite occurs in many localities around the world. Within the UK, blue fluorspars are also found in County Durham , especially Weardale . [ 1 ] : 39 Elsewhere, blue fluorspar is known in the Ardennes region of Belgium; the Cave-in-Rock area of Illinois in the United States; [ 1 ] : 39 and at various localities in Mexico and China.
Antozonite (variety of fluorite) Anyolite (metamorphic rock - zoisite, ruby, and hornblende) Aquamarine (light blue variety of beryl) Argentite (high temperature form of acanthite) Asbestos (fibrous serpentine- or amphibole minerals) Auerlite (variety of thorite) Avalite (chromian variety of illite) Aventurine (variety of quartz)
[citation needed] Because fluoride levels in water are usually controlled by the solubility of fluorite (CaF 2), high natural fluoride levels are associated with calcium-deficient, alkaline, and soft waters. [52] Defluoridation is needed when the naturally occurring fluoride level exceeds recommended limits.
The fluorite structure refers to a common motif for compounds with the formula MX 2. [ 1 ] [ 2 ] The X ions occupy the eight tetrahedral interstitial sites whereas M ions occupy the regular sites of a face-centered cubic (FCC) structure.