Vantasselite

General Information:
 Chemical Formula:
Al4(PO4)3(OH)3·9(H2O)
 Composition:
(Molecular Weight = 606.00 gm)
Aluminum 17.81 % Al
Phosphorus 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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