Chemical Formula: Cu8S5
Help on Composition: Composition: Molecular Weight = 668.7 g
 
Sulfur 23.98 % S 0.00 % 0.00 %
Copper 76.02 % Cu 0.00 % 0.00 %
100.00 %
 
Help on Empirical Formula: Empirical Formula: Cu8S5
Help on Environment: Environment: Replacing sphalerite along cleavage traces
Help on Locality: Locality: In DeKalb Township, St. Lawrence Co., New York, and from Cuchillo, Winston district, Sierra Co., New Mexico, USA.. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor the original collector, Adam Geer, of Utica, New York, USA
Help on Synonym: Synonym: