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:white
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