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![Mineralogy Database Mineralogy Database](/images/Hedyphane_Crystal.gif) |
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 |
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 |
![](../images/Reflect_scale_v.gif) |
∑ R(λ) |
400 nm |
21.50 |
![](../images/400nm.BMP) |
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420 nm |
21.00 |
![](../images/420nm.BMP) |
440 nm |
20.50 |
![](../images/440nm.BMP) |
460 nm |
20.20 |
![](../images/460nm.BMP) |
480 nm |
20.00 |
![](../images/480nm.BMP) |
500 nm |
19.90 |
![](../images/500nm.BMP) |
520 nm |
20.10 |
![](../images/520nm.BMP) |
540 nm |
20.60 |
![](../images/540nm.BMP) |
560 nm |
21.20 |
![](../images/560nm.BMP) |
580 nm |
21.80 |
![](../images/580nm.BMP) |
600 nm |
22.60 |
![](../images/600nm.BMP) |
620 nm |
23.50 |
![](../images/620nm.BMP) |
640 nm |
24.00 |
![](../images/640nm.BMP) |
660 nm |
24.60 |
![](../images/660nm.BMP) |
680 nm |
25.00 |
![](../images/680nm.BMP) |
700 nm |
25.40 |
![](../images/700nm.BMP) |
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. |
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. |
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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Ask about Germanite here :
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Print or Cut-and-Paste your Germanite Specimen Label here :
Germanite
Cu26Fe4Ge4S32
Dana No: 02.09.04.02 Strunz No: 02.CB.30
Locality:
Notes:
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