General Information:
Chemical Formula:Al4(PO4)3(OH)3·9(H2O)
Composition:(Molecular Weight = 606.00 gm)Aluminum 17.81 %
AlPhosphorus 15.33 %
P Hydrogen 3.49 %
H Oxygen 63.36 %
O Empirical Formula: Al4(PO4)3(OH)3·9(H2O)
Environment:On the dumps of a quartzite quarry.
IMA Status:Approved IMA 1986
Locality:Stavelot massif, Bihain, Belgium.
Name Origin:Named for Rene Van Tassel (1916-), mineralogist of phosphate and sulfate minerals.
Physical Properties: Cleavage:[001] Good
Color:pearl white.
Density:2.3
Diaphaniety:Transparent to Translucent
Habits:Rosette - Bundled tabular aggregates resembling rose flower petals., ,
Hardness:2-2.5 - Gypsum-Finger Nail
Luster:Greasy (Oily)
Streak:white
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