General Information:
Chemical Formula:
Al11(PO4)9(OH)6·38(H2O) or Al6(PO4)5(OH)3·23(H2O)
Composition:
(Molecular Weight = 1,938.16 gm)
Aluminum 15.31 % Al
Phosphorus 14.38 % P
Hydrogen 4.26 % H
Oxygen 66.04 % O
Empirical Formula:
Al11(PO4)9(OH)6·38(H2O)
Environment:
Found with variscite, apatite.
Locality:
Zeleznik (Vashegy) mine, Sirk River, Slovakia, Boehmia, Czech Republic.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
[001] Perfect
Color:
brownish, brownish yellow, yellow, white, or light green.
Density:
1.93 - 1.99, Average = 1.96
Diaphaniety:
Subtranslucent to Opaque
Habits:
Fibrous - Crystals made up of fibers., Massive - Uniformly indistinguishable crystals forming large masses., Compact - Occurs as a compact mass.
Hardness:
2-3 - Gypsum-Calcite
Luminescence:
Non-fluorescent.
Luster:
Earthy (Dull)
Streak:
white
More details...