Sanjuanite

General Information:
 Chemical Formula:
Al2(PO4)(SO4)(OH)·9(H2O)
 Composition:
(Molecular Weight = 424.14 gm)
Aluminum 12.72 % Al
Phosphorus 7.30 % P 
Hydrogen 4.52 % H 
Sulfur 7.56 % S 
Oxygen 67.90 % O 
 Empirical Formula:
Al2(PO4)(SO4)(OH)·9(H2O)
 IMA Status:
Approved IMA 1968
 Locality:
Sierra Chica de Zonda, San Juan Province, Argentina.
 Name Origin:
Named for the locality.
Physical Properties:
 Cleavage:
None
 Color:
white.
 Density:
1.94
 Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
 Hardness:
3 - Calcite
 Luster:
Silky
 Streak:
white
More details...