Carbonate-fluorapatite

General Information: Chemical Formula:Ca5(PO4,CO3)3F Composition:(Molecular Weight = 486.82 gm)Calcium 41.16 % CaPhosphorus 15.91 % P Carbon 1.23 % C Oxygen 37.79 % O Fluorine 3.90 % F  Empirical Formula: Ca5(PO4)2.5(CO3)0.5F Environment:Sedimentary and skarn rocks. Locality:Wheal Franco, Devonshire, England. Name Origin:Named as the carbonate and fluorine end-member and from the Greek apatao - "I am misleading."Physical Properties: Color:colorless or whitish. Density:3.12 Diaphaniety:Transparent to Translucent Habits:Massive - Uniformly indistinguishable crystals forming large masses., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., Pulverulent - Forms a l oose, poorly-coherent powdery mass. Hardness:5 - Apatite Luster:Vitreous - Resinous Streak:whiteMore details...