Arsenocrandallite

General Information:
 Chemical Formula:
(Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O)
 Composition:
(Molecular Weight = 595.75 gm)
Strontium 11.03 % Sr
Calcium 15.14 % Ca
Aluminum 13.59 % Al
Arsenic 18.86 % As
Phosphorus 2.60 % P 
Hydrogen 1.18 % H 
Oxygen 37.60 % O 
 Empirical Formula:
Ca2.25Sr0.75Al3(AsO4)1.5(PO4)0.5(OH)5·(H2O)
 IMA Status:
Approved IMA 1982
Physical Properties:
 Cleavage:
None
 Color:
blue or blue green.
 Density:
3.25
 Diaphaniety:
Transparent
 Hardness:
5.5 - Knife Blade
 Luster:
Vitreous (Glassy)
 Streak:
white
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