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Germanite Mineral Data
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General Germanite Information
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 Chemical Formula: |
Cu26Fe4Ge4S32 |
| Composition: |
Molecular Weight = 3,192.14 gm |
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Iron 7.00 % Fe |
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Copper 51.76 % Cu |
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Germanium 9.10 % Ge |
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Sulfur 32.14 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu26Fe2+4Ge4S32 |
| Environment: |
In primary Cu-Pb-Zn ores. |
| IMA Status: |
Valid Species (Pre-IMA) 1922 |
| Locality: |
Tsumeb mine (Tsumcorp mine), Tsumeb, Otavi, Namibia Link to MinDat.org Location Data. |
| Name Origin: |
Named after its content of the element Germanium. |
| Synonym: |
ICSD 64787 |
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PDF 36-395 |
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Germanite Image |
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Images:
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Germanite Crystallography
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| Cell Dimensions: |
a = 10.5862, Z = 1; V = 1,186.37 Den(Calc)= 4.47 |
| Crystal System: |
Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: P 43n |
| X Ray Diffraction: |
By Intensity(I/Io): 3.054(1), 1.87(0.7), 1.595(0.4), |
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Physical Properties of Germanite
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| Cleavage: |
None |
| Color: |
Brown, Red gray. |
| Density: |
4.4 - 4.6, Average = 4.5 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Hardness: |
3 - Calcite |
| Luster: |
Metallic |
| Streak: |
dark gray |
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Optical Properties of Germanite
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| RL Color: |
Pinkish gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Germanite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
21.50 |
 |
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| 420 nm |
21.00 |
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| 440 nm |
20.50 |
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| 460 nm |
20.20 |
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| 480 nm |
20.00 |
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| 500 nm |
19.90 |
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| 520 nm |
20.10 |
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| 540 nm |
20.60 |
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| 560 nm |
21.20 |
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| 580 nm |
21.80 |
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| 600 nm |
22.60 |
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| 620 nm |
23.50 |
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| 640 nm |
24.00 |
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| 660 nm |
24.60 |
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| 680 nm |
25.00 |
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| 700 nm |
25.40 |
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Calculated Relative Intensity Colors of Germanite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
430% |
| R |
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Calculated Properties of Germanite
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| Electron Density: |
Bulk Density (Electron Density)=4.20 gm/cc
note: Specific Gravity of Germanite =4.47 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEGermanite = 32.75 barns/electron
U=PEGermanite x rElectron Density= 137.38 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Germanite is Not Radioactive |
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Germanite Classification
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| Dana Class: |
02.09.04.02 (02)Sulfides - Including Selenides and Tellurides |
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(02.09)where Am Bn Xp, with (m+n):p=1:1 |
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(02.09.04)Germanite Group |
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02.09.04.01 Renierite (Cu,Zn)11(Ge,As)2Fe4S16 P 42c- 4 2m |
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02.09.04.02 Germanite Cu26Fe4Ge4S32 P 43n 4 3m |
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02.09.04.03 Maikainite! Cu20(Fe,Cu)6Mo2Ge6S32 P 43n 4 3m |
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02.09.04.04 Ovamboite! Cu20(Fe,Cu,Zn)6W2Ge6S32 P 43n 4 3m |
| Strunz Class: |
02.CB.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CB -With Zn, Fe, Cu, Ag, Au, etc |
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02.CB.30 Colusite Cu12-13V(As,Sb,Sn,Ge)3S16 P 43n 4 3m |
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02.CB.30 Germanite Cu26Fe4Ge4S32 P 43n 4 3m |
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02.CB.30 Germanocolusite Cu13V(Ge,As)3S16 P 43n 4 3m |
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02.CB.30 Nekrasovite Cu26V2(Sn,As,Sb)6S32 P 43n 4 3m |
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02.CB.30 Stibiocolusite Cu13V(Sb,As,Sn)3S16 P 43n 4 3m |
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02.CB.30 Maikainite! Cu20(Fe,Cu)6Mo2Ge6S32 P 43n 4 3m |
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02.CB.30 Ovamboite! Cu20(Fe,Cu,Zn)6W2Ge6S32 P 43n 4 3m |
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Other Germanite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Germanite :
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 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
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Print or Cut-and-Paste your Germanite Specimen Label here :
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Germanite
Cu26Fe4Ge4S32
Dana No: 02.09.04.02 Strunz No: 02.CB.30
Locality:
Notes:
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