Chemical Formula:
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(Ag,Cu,Fe)9(Se,S)8 |
Composition:
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Molecular Weight = 1342.22 g |
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Sulfur |
4.78 % |
S |
0.00 % |
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0.00 % |
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Iron |
3.74 % |
Fe |
0.00 % |
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0.00 % |
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Copper |
12.78 % |
Cu |
0.00 % |
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0.00 % |
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Selenium |
35.30 % |
Se |
0.00 % |
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0.00 % |
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Silver |
43.40 % |
Ag |
0.00 % |
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0.00 % |
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100.00 % |
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Empirical Formula:
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Ag5.4Cu2.7Fe2+0.9Se6S2 |
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Environment:
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As late stage deposits in veins cutting granite |
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Locality:
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From Chameane, Puy-de-Dome, France.. Link to
MinDat.org
Location Data.
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Name Origin:
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To honor Jaques Geffroy, metallugist for the French Atomic Energy Commission |
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Synonym:
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