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Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite, chlorapatite and bromapatite. Apatite is one of a few minerals that are produced and used by biological micro-environmental systems. (source: Wikipedia) Photo by Michael Marcotte Photo courtesy Heritage Auctions green apatite Return to List Back to Michael's Hobbies page Back to Michael Marcotte's HomePage