Sanjuanite

General Information: Chemical Formula:Al2(PO4)(SO4)(OH)·9(H2O) Composition:(Molecular Weight = 424.14 gm)Aluminum 12.72 % AlPhosphorus 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:whiteMore details...