Johnbaumite

General Information: Chemical Formula:Ca5(AsO4)3(OH) Composition:(Molecular Weight = 634.15 gm)Calcium 31.60 % CaArsenic 35.44 % AsHydrogen 0.16 % H Oxygen 32.80 % O  Empirical Formula: Ca5(AsO4)3(OH) Environment:As analog of hydroxylapatite and (OH) analog of svabite. IMA Status:Approved IMA 1980 Locality:Palmer Shaft, Franklin mine, Franklin, Sussex County, New Jersey, USA. Name Origin:Named for John L. Baum (1916-), resident geologist of the New Jersey Zinc Co. and curator of the Franklin Mineral Museum, Franklin, New Jersey, USA.Physical Properties: Cleavage:[1010] Distinct Color:colorless or white. Density:3.65 Diaphaniety:Transparent Habits:Massive - Uniformly indistinguishable crystals forming large masses., Anhedral Grains - Granular minerals without the expression of crystal shapes, Hardness:4.5 - Between Fluorite and Apatite Luminescence:Fluorescent, Short UV=pink orange. Luster:Vitreous - Greasy Streak:whiteMore details...