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(mineralogy) A calcium fluoride phosphate of variable composition, sometimes used in the manufacture of fertilizer, as a gemstone, and (in powdered form) as a pigment, and also produced biologically in bones and teeth.
Apatite (purple), on siderite, from Portugal
(mineralogy) A calcium fluoride phosphate of variable composition, sometimes used in the manufacture of fertilizer, as a gemstone, and (in powdered form) as a pigment, and also produced biologically in bones and teeth.
Faceted blue apatite, Brazil
(mineralogy) A calcium fluoride phosphate of variable composition, sometimes used in the manufacture of fertilizer, as a gemstone, and (in powdered form) as a pigment, and also produced biologically in bones and teeth.
Apatite in photomicrographs of a thin section from the Siilinjärvi apatite mine. In cross-polarized light on left, plane-polarized light on right.