Johnbaumite

General Information:
 Chemical Formula:
Ca5(AsO4)3(OH)
 Composition:
(Molecular Weight = 634.15 gm)
Calcium 31.60 % Ca
Arsenic 35.44 % As
Hydrogen 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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