General Information:
Chemical Formula:ZnAl2(AsO4)(OH)5
Composition:(Molecular Weight = 343.31 gm)Aluminum 15.72 %
AlZinc 19.05 %
ZnArsenic 21.82 %
AsHydrogen 1.47 %
H Oxygen 41.94 %
O Empirical Formula: ZnAl2(AsO4)(OH)5
Environment:Deeply oxidized ore zone at Tsumeb.
IMA Status:Approved IMA 1985
Locality:Tsumeb, Namibia.
Name Origin:Named for Gerd Tremmel, who first recognized the mineral.
Physical Properties: Cleavage:None
Color:brown, yellowish brown, or dark brown.
Diaphaniety:Transparent
Habits:Spherical - Spherical, rounded aggregates., Tabular - Form dimensions are thin in one direction.,
Luminescence:Non-fluorescent.
Luster:Adamantine
Streak:white
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