Mineralogy Database

Geffroyite Mineral Data

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General Geffroyite Information

Help on Chemical  Formula: Chemical Formula: (Ag,Cu,Fe)9(Se,S)8
Help on Composition: Composition: Molecular Weight = 1,342.22 gm
   Iron       3.74 %  Fe
   Copper    12.78 %  Cu
   Silver    43.40 %  Ag
   Selenium  35.30 %  Se
   Sulfur     4.78 %  S
            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. Micro-myrmikitic texture intergrowth with clausthalite and eskebornite.
Help on IMA Status: IMA Status: Approved IMA 1982
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 Name Pronunciation: Name Pronunciation: Geffroyite + Pronunciation Say GEFFROYITE