General Information:
Chemical Formula:
Cu5Zn5[(As+++++,Sb+++++)O4]2(OH)14
Composition:
(Molecular Weight = 1,184.04 gm)
Zinc 27.61 % Zn
Copper 26.83 % Cu
Antimony 5.14 % Sb
Arsenic 9.49 % As
Hydrogen 1.19 % H
Oxygen 29.73 % O
Empirical Formula:
Cu5Zn5(AsO4)1.5(SbO4)0.5(OH)14
Environment:
Found in a uranium prospect.
IMA Status:
Approved IMA 1980
Locality:
Durango, La Plata, County, Colorade, USA.
Name Origin:
Named for Nicholas J. Theis, Geologist, Bendix Corp., who discovered the orignal sample.
Physical Properties:
Cleavage:
[001] Perfect
Color:
blue green or green.
Density:
4.3
Diaphaniety:
Translucent
Habits:
Aggregates - Made of numerous individual crystals or clusters., ,
Hardness:
1.5 - Between Talc and Gypsum
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