Germanite Mineral Data (original) (raw)

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

Click Here for Larger Germanite Image in a New Browser Window Images:

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 - HextetrahedralH-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),

Click Here for Large Germanite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Help on Above

| | Tettenhorst R T , Corbato C E , American Mineralogist , 69 (1984) p.943-947, Crystal structure of germanite, Cu26Ge4Fe4S32, determined by powder X-ray, diffraction | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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

RelativeIntensity 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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Ask about Germanite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

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: