Tarbuttite

General Information:
 Chemical Formula:
Zn2(PO4)(OH)
 Composition:
(Molecular Weight = 242.76 gm)
Zinc 53.87 % Zn
Phosphorus 12.76 % P 
Hydrogen 0.42 % H 
Oxygen 32.95 % O 
 Empirical Formula:
Zn2(PO4)(OH)
Physical Properties:
 Cleavage:
[010] Perfect
 Color:
brown, colorless, green, white, or light yellow.
 Density:
4.14
 Diaphaniety:
Transparent to Translucent
 Hardness:
4 - Fluorite
 Luminescence:
Fluorescent.
 Luster:
Vitreous - Pearly
 Streak:
white
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