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apatite

apatite A widely distributed phosphate mineral, with the formula Ca5(PO4)3(F,Cl,OH); sp. gr. 3.1–3.3; hardness 5; hexagonal; usually a shade of green or grey-green, but may also be white, brown, yellow, bluish, or red; white streak; vitreous lustre; crystals commonly hexagonal prisms, and often tabular, also occurs massive, and granular; cleavage, basal {0001}, imperfect prismatic {1010}; found as an accessory mineral in igneous rock, in pegmatites and high-temperature hydrothermal veins, and in metamorphic rocks. It is the principal constituent of fossil bones (see also COLLOPHANE). Apatite is widely used as a phosphate fertilizer, and for the production of phosphoric acid and various other chemicals.

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apatite

apatite (ăp´ətīt), mineral, a phosphate of calcium containing chlorine or fluorine, or both, that is transparent to opaque in shades of green, brown, yellow, white, red, and purple. Apatite is a minor constituent in igneous and metamorphic rocks. Yellow-green asparagus stone and blue-green manganapatite are used in jewelry. Apatite is mined to make phosphatic fertilizers and is used in fission track dating of rocks (see dating). Commercial deposits are mined in Idaho, Tennessee, and Wyoming, and in N Africa and Russia.

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apatite

apatite A complex mineral form of the salt calcium phosphate, Ca5(PO4)3(OH,F,Cl), that is the main constituent of the enamel of teeth.

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