Chemical Formula: (Ag,Cu,Fe)9(Se,S)8
Help on Composition: Composition: Molecular Weight = 1342.22 g
 
Sulfur 4.78 % S 0.00 % 0.00 %
Iron 3.74 % Fe 0.00 % 0.00 %
Copper 12.78 % Cu 0.00 % 0.00 %
Selenium 35.30 % Se 0.00 % 0.00 %
Silver 43.40 % Ag 0.00 % 0.00 %

100.00 %
 
Help on Empirical Formula: Empirical Formula: Ag5.4Cu2.7Fe2+0.9Se6S2
Help on Environment: Environment: As late stage deposits in veins cutting granite
Help on Locality: Locality: From Chameane, Puy-de-Dome, France.. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor Jaques Geffroy, metallugist for the French Atomic Energy Commission
Help on Synonym: Synonym: