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 %
AlPhosphorus 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
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