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Geerite Mineral Data
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General Geerite Information
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 Chemical Formula: |
Cu8S5 |
| Composition: |
Molecular Weight = 668.70 gm |
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Copper 76.02 % Cu |
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Sulfur 23.98 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu8S5 |
| Environment: |
Replacing sphalerite along cleavage traces. |
| IMA Status: |
Approved IMA 1980 |
| Locality: |
In DeKalb Township, St. Lawrence Co., New York, and from Cuchillo, Winston district, Sierra Co., New Mexico, USA. Link to MinDat.org Location Data. |
| Name Origin: |
To honor the original collector, Adam Geer, of Utica, New York, USA. |
| Name Pronunciation: |
Geerite  |
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Geerite Crystallography
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| Axial Ratios: |
a:c = 1:12.22976 |
| Cell Dimensions: |
a = 3.83, c = 46.84, Z = 3; V = 595.04 Den(Calc)= 5.60 |
| Crystal System: |
Trigonal Space Group: R 3m, R 3m, or R 32 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.128(1), 1.918(0.5), 1.637(0.3), |
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Physical Properties of Geerite
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| Color: |
White, Blue gray. |
| Diaphaneity: |
Opaque |
| Habit: |
Platy - Sheet forms (e.g. micas). |
| Hardness: |
3.5-4 - Copper Penny-Fluorite |
| Luster: |
Metallic |
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Optical Properties of Geerite
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| RL Anisotrophism: |
Moderate, in yellow. |
| RL Color: |
Bluish white. |
| RL Pleochroism: |
Weak. |
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Calculated Properties of Geerite
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| Electron Density: |
Bulk Density (Electron Density)=5.23 gm/cc
note: Specific Gravity of Geerite =5.60 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0017982333
Boson Index = 0.9982017667 |
| Photoelectric: |
PEGeerite = 35.58 barns/electron
U=PEGeerite x rElectron Density= 185.91 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Geerite is Not Radioactive |
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Geerite Classification
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| Dana Class: |
02.04.07.06 (02)Sulfides - Including Selenides and Tellurides |
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(02.04)where Am Bn Xp, with (m+n):p=2:1 |
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(02.04.07)Chalcocite Group ([Cu]2-x S] formulae) |
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02.04.07.01 Chalcocite Cu2S P 21/c 2/m |
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02.04.07.02 Djurleite Cu31S16 P 21/n 2/m |
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02.04.07.03 Digenite Cu9S5 R 3m 3 2/m |
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02.04.07.04 Roxbyite Cu1.78S C 2/m 2/m |
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02.04.07.05 Anilite Cu7S4 P nma 2/m 2/m 2/m |
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02.04.07.06 Geerite Cu8S5 R 3m, R 3m, or R 32 Trig |
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02.04.07.07 Spionkopite Cu1.4S P 3m1 ? 3m |
| Strunz Class: |
02.BA.05c 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.BA -With Cu, Ag, Au |
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02.BA.05c Geerite Cu8S5 R 3m, R 3m, or R 32 Trig |
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Other Geerite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Geerite :
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
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Print or Cut-and-Paste your Geerite Specimen Label here :
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Geerite
Cu8S5
Dana No: 02.04.07.06 Strunz No: 02.BA.05c
Locality:
Notes:
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