Whitlockite
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Whitlockite is a mineral, an unusual form of calcium phosphate. It's actual formula is debatable depending on the authority consulted; starting from Ca3(PO4)2 it may also contain magnesium (CaMg)2(PO4)2 to the more complex Ca9(MgFe)(PO4)6PO3OH. It is a relatively rare mineral but is found in granitic pegmatite and has also been found in meteorites.
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