General Information:
Chemical Formula:
ZnAl2(AsO4)(OH)5
Composition:
(Molecular Weight = 343.31 gm)
Aluminum 15.72 % Al
Zinc 19.05 % Zn
Arsenic 21.82 % As
Hydrogen 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
More details...