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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
 
Because HA is the prototype of biological apatites, which are in nano crystalline forms, extensive efforts have been made to produce synthetic nano HA materials.
Properties of nanostructured hydroxyapatite prepared by a spray ... by Hockey, Bernard / Journal of Research of the National Institute of Standards and Technology
In one of the Japanese studies, scientists from the Biomaterials Laboratory, Faculty of Engineering at Okayama University in Japan examined the blood compatibility and protein adsorption of hydroxyapatite and hydroxyl-carbonate apatites.
MIV Therapeutics Claims of Total Biocompatibility of Hydroxyapatite ... by Business Wire
In general, these impure biological apatites are designated as calcium deficient or non-stoichiometric apatites.
Preparation and comprehensive characterization of a calcium ... by Tung, Ming S. / Journal of Research of the National Institute of Standards and Technology
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