Orpheite

General Information:
 Chemical Formula:
PbAl3(PO4,SO4)2(OH)6 (?)
 Composition:
(Molecular Weight = 580.68 gm)
Aluminum 13.94 % Al
Phosphorus 8.00 % P 
Hydrogen 1.04 % H 
Lead 35.68 % Pb
Sulfur 2.76 % S 
Oxygen 38.57 % O 
 Empirical Formula:
PbAl3(PO4)1.5(SO4)0.5(OH)6
 IMA Status:
Approved IMA 1972
Physical Properties:
 Color:
colorless, gray, gray blue, yellow green, or light blue.
 Density:
3.75
 Diaphaniety:
Transparent to Translucent
 Hardness:
3.5 - Copper Penny
 Luminescence:
Fluorescent.
 Streak:
white
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