Formula :
Al4[(OH)3/(PO4)3] * 9 H2O
System: orthorhombic Hardness:2-2½ Rarity:very rare
Strunz id:VII/D.12-20 -
PHOSPHATES, ARSENATES and VANADATES
Name origin: Named after Professor René Van Tassel (May 11th, 1916, Antwerp, Belgium - March 20th, 2013, Mortsel, Belgium), a mineralogist at the Royal Belgian Institute of Natural Sciences known for his work on the minerals of Belgium, particularly sulfates and phosphates.
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