Mineralogy Database

Germanite Mineral Data

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General Germanite Information

Help on Chemical  Formula: Chemical Formula: Cu26Fe4Ge4S32
Help on Composition: Composition: Molecular Weight = 3,192.14 gm
   Iron        7.00 %  Fe
   Copper     51.76 %  Cu
   Germanium   9.10 %  Ge
   Sulfur     32.14 %  S
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: Cu26Fe2+4Ge4S32
Help on Environment: Environment: In primary Cu-Pb-Zn ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1922
Help on Locality: Locality: Tsumeb mine (Tsumcorp mine), Tsumeb, Otavi, Namibia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its content of the element Germanium.
Help on Synonym: Synonym: ICSD 64787
  PDF 36-395
 

Germanite Image

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  Germanite

Comments: Red metallic germanite, tarnishing black.
Location: Tsumeb, Oshikoto, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Germanite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 10.5862, Z = 1; V = 1,186.37 Den(Calc)= 4.47
Help on Crystal System: Crystal System: Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: P 43n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.054(1), 1.87(0.7), 1.595(0.4),
 

Physical Properties of Germanite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Red gray.
Help on Density: Density: 4.4 - 4.6, Average = 4.5
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: dark gray
 

Optical Properties of Germanite

Help on RL Color: RL Color: Pinkish gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Germanite in Air
λ R  ∑ R(λ) 
 400 nm   21.50   
 420 nm   21.00 
 440 nm   20.50 
 460 nm   20.20 
 480 nm   20.00 
 500 nm   19.90 
 520 nm   20.10 
 540 nm   20.60 
 560 nm   21.20 
 580 nm   21.80 
 600 nm   22.60 
 620 nm   23.50 
 640 nm   24.00 
 660 nm   24.60 
 680 nm   25.00 
 700 nm   25.40 
Calculated Relative Intensity Colors of Germanite in Air
Relative
Intensity
   0%   50% 100% 150% 200% 250% 300% 350% 400% 430%
R                    
 

Calculated Properties of Germanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.20 gm/cc
note: Specific Gravity of Germanite =4.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGermanite = 32.75 barns/electron
U=PEGermanite x rElectron Density= 137.38 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Germanite is Not Radioactive
 

Germanite Classification

Help on  Dana Class: Dana Class: 02.09.04.02 (02)Sulfides - Including Selenides and Tellurides
  (02.09)where Am Bn Xp, with (m+n):p=1:1
  (02.09.04)Germanite Group
 
02.09.04.01 Renierite (Cu,Zn)11(Ge,As)2Fe4S16 P 42c- 4 2m
 
02.09.04.02 Germanite Cu26Fe4Ge4S32 P 43n 4 3m
 
02.09.04.03 Maikainite! Cu20(Fe,Cu)6Mo2Ge6S32 P 43n 4 3m
 
02.09.04.04 Ovamboite! Cu20(Fe,Cu,Zn)6W2Ge6S32 P 43n 4 3m
Help on  Strunz Class: Strunz Class: 02.CB.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.C - Metal Sulfides, M:S = 1:1 (and similar)
  02.CB -With Zn, Fe, Cu, Ag, Au, etc
 
02.CB.30 Colusite Cu12-13V(As,Sb,Sn,Ge)3S16 P 43n 4 3m
 
02.CB.30 Germanite Cu26Fe4Ge4S32 P 43n 4 3m
 
02.CB.30 Germanocolusite Cu13V(Ge,As)3S16 P 43n 4 3m
 
02.CB.30 Nekrasovite Cu26V2(Sn,As,Sb)6S32 P 43n 4 3m
 
02.CB.30 Stibiocolusite Cu13V(Sb,As,Sn)3S16 P 43n 4 3m
 
02.CB.30 Maikainite! Cu20(Fe,Cu)6Mo2Ge6S32 P 43n 4 3m
 
02.CB.30 Ovamboite! Cu20(Fe,Cu,Zn)6W2Ge6S32 P 43n 4 3m
 

Other Germanite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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 :

Germanite

Cu26Fe4Ge4S32
Dana No: 02.09.04.02 Strunz No: 02.CB.30
Locality:

 

Notes:

 

 
   
 


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