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Geffroyite Mineral Data
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General Geffroyite Information
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 Chemical Formula: |
(Ag,Cu,Fe)9(Se,S)8 |
| Composition: |
Molecular Weight = 1,342.22 gm |
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Iron 3.74 % Fe |
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Copper 12.78 % Cu |
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Silver 43.40 % Ag |
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Selenium 35.30 % Se |
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Sulfur 4.78 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag5.4Cu2.7Fe2+0.9Se6S2 |
| Environment: |
As late stage deposits in veins cutting granite. Micro-myrmikitic texture intergrowth with clausthalite and eskebornite. |
| IMA Status: |
Approved IMA 1982 |
| Locality: |
From Chameane, Puy-de-Dome, France. Link to MinDat.org Location Data. |
| Name Origin: |
To honor Jaques Geffroy, metallugist for the French Atomic Energy Commission. |
| Name Pronunciation: |
Geffroyite + Pronunciation  |
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