1890 Gram very beautiful natural purplish fluorite crystal specimen with calcite For Sale

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1890 Gram very beautiful natural purplish fluorite crystal specimen with calcite:
$238.00

Fluorite, common halide mineral, calcium fluoride (CaF2), which is the principalfluorinemineral. It is usually quite pure, but as much as 20 percentyttriumorceriummay replacecalcium. Fluorite occurs most commonly as a glassy, many-hued vein mineral and is often associated with lead and silver ores; it also occurs in cavities, in sedimentary rocks, in pegmatites, and in hot-spring areas. China and Mexico are the world’s major producers of flourite; the mineral is alsowidespreadinRussia, Brazil, and Spain. Fluorite is used as afluxin the manufacture of open-hearthsteel, of aluminum fluoride, of artificialcryolite, and ofaluminum. It is used in opalescentglass, in iron and steel enamelware, in the production of hydrofluoric acid, in the refining of lead andantimony, and in the manufacture of high-octane fuels (as a catalyst). Because of its lowindex of refractionand low dispersion, clear colourless fluorite of optical quality is used for apochromatic lenses. At one time blue john, a variety fromDerbyshire,England, was widely used in ornamental vases and other objects. For detailed physical properties,seehalide mineral(table).

1890 Gram very beautiful natural purplish fluorite crystal specimen with calcite

$238.00

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