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apatite

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apatite

Common calcium phosphate mineral, Ca5(PO4)3(F,OH,Cl). Apatite has a hexagonal structure and occurs widely in igneous rocks, such as pegmatite, and in contact metamorphic rocks, such as marbles. It is used in the manufacture of fertilizer and as a source of phosphorus. Carbonate hydroxylapatite, Ca5(PO4,CO3)3(OH)2, is the chief constituent of tooth enamel and, together with other related phosphate minerals, is the inorganic constituent of bone. Apatite ranks 5 on the Mohs scale of hardness.



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? Mentioned in ? References in periodicals archive
 
This specific deposit contains 70 per cent calcite, a form of calcium carbonate; 10 per cent apatite, a rock phosphate (source of calcium and phosphorous); 15 per cent biotite/vermiculite; and 5 per cent of accessory minerals such as pyroxene, chlorite, magnetite, and feldspar.
Healthier, hardier crops--from a geologist? by Larmour, Adelle / Northern Ontario Business
Good Food, Simply Prepared: A Collection Of Recipes From Three Generations Of The Styrna Family by Joan Styrna is an eclectic and fun collection of creative and inventive compendium of mouth-watering, easy-to-prepare, apatite satisfying recipes for all dining occasions.
Good Food, Simply Prepared by Small Press Bookwatch
Some of the crystals contain inclusions of very fine-grained tourmaline or euhedral, green-blue apatite, and some are veined by free-grained, equigranular apatite that is indicative of albitic replacement (Breaks, 1989).
Emerald and aquamarine mineralization in Canada by Neufeld, Heather L.D. / Geoscience Canada
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