General Geffroyite Information![]() (Ag,Cu,Fe)9(Se,S)8 |
![]() 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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100.00 % |
![]() Ag5.4Cu2.7Fe2+0.9Se6S2 |
![]() As late stage deposits in veins cutting granite. Micro-myrmikitic texture intergrowth with clausthalite and eskebornite. |
![]() Approved IMA 1982 |
![]() From Chameane, Puy-de-Dome, France. Link to MinDat.org Location Data. |
![]() To honor Jaques Geffroy, metallugist for the French Atomic Energy Commission. |
![]() Geffroyite + Pronunciation |
![]() | | Geffroyite Image
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Geffroyite Crystallography![]() a = 10.889, Z = 3; V = 1,291.11 Den(Calc)= 5.18 |
![]() Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m |
![]() By Intensity(I/Io): 1.925(1), 3.145(0.9), 3.282(0.9), |
| Physical Properties of Geffroyite![]() Bronze brown. |
![]() 5.39 |
![]() Opaque |
![]() 2.5 - Finger Nail |
![]() Metallic |
| Optical Properties of Geffroyite![]() Brown with a creamy tint. |
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| Calculated Properties of Geffroyite![]() Bulk Density (Electron Density)=4.57 gm/cc |
note: Specific Gravity of Geffroyite =5.18 gm/cc. ![]() Fermion Index = 0.02 |
Boson Index = 0.98 ![]() PEGeffroyite = 147.93 barns/electron |
U=PEGeffroyite x rElectron Density= 675.39 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Geffroyite is Not Radioactive | Geffroyite Classification![]() 02.07.01.06 (02)Sulfides - Including Selenides and Tellurides |
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(02.07)where Am Bn Xp, with (m+n):p=9:8 |
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(02.07.01)Pentalndite Group (Isometric: Fm3m) |
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![]() 02.BB.15a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BB -With Ni, Fe |
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| Other Geffroyite Information![]() NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
![]() Links to other databases for Geffroyite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - GeoScienceWorld 6 - Google Images 7 - Google Scholar 8 - Handbook of Mineralogy (MinSocAm) 9 - Handbook of Mineralogy (UofA) 10 - MinDAT 11 - Mineralienatlas (Deutsch) 12 - Online Mineral Museum 13 - QUT Mineral Atlas 14 - Ruff.Info Search for Geffroyite using: Visit our Advertisers for Geffroyite : A Bijoux Google Search for GeffroyiteAdam's Minerals Google Search for Geffroyite Cape Minerals Google Search for Geffroyite Dakota Matrix Minerals Google Search for Geffroyite Excalibur Mineral Corp. Google Search for Geffroyite Exceptional Minerals Google Search for Geffroyite John Betts Fine Minerals Search for Geffroyite McDougall Minerals Google Search for Geffroyite Mineral News Website Link Rock and Mineral Shows Google Search for Geffroyite Weinrich Minerals, Inc. Google Search for Geffroyite Ask about Geffroyite here : Print or Cut-and-Paste your Geffroyite Specimen Label here :
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