Mineralogy Database

Abswurmbachite Mineral Data

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General Abswurmbachite Information

Help on Chemical  Formula: Chemical Formula: Cu++Mn+++6SiO12
Help on Composition: Composition: Molecular Weight = 615.45 gm
   Manganese  50.88 %  Mn    2.31 % MnO / 70.54 % Mn2O3
   Aluminum    0.44 %  Al    0.83 % Al2O3
   Iron        3.63 %  Fe    5.19 % Fe2O3
   Copper      9.29 %  Cu   11.63 % CuO
   Silicon     4.56 %  Si    9.76 % SiO2
   Oxygen     31.20 %  O
             ______        ______ 
             100.00 %      100.26 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu0.9Mn2+0.2Mn3+5.5Fe3+0.4Al0.1SiO12
Help on Environment: Environment: In very low-grade, high pressure metamorphic Mn, Al-rich sediments.
Help on IMA Status: IMA Status: Approved IMA 1991
Help on Locality: Locality: Milli, Avia and Andros Island, Greece. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Irmgard Abs-Wurmbach (1938-), German mineralogist.
Help on Name Pronunciation: Name Pronunciation: Abswurmbachite + Pronunciation Say ABSWURMBACHITE
Help on Synonym: Synonym: ICSD 71823
  PDF 41-576

Abswurmbachite Image

Click Here for Larger   Image in a New Browser Window Images:
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Comments: Series of images showing the out-crop, the selected nodule and finally a BSE image of abswurmbachite. (AmMin, v86:205).
Location: Sanbagawa metamorphic belt, Japan. Scale: See Images.
© American Mineralogist

Abswurmbachite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.97172
Help on Cell Dimensions: Cell Dimensions: a = 9.406, c = 18.546, Z = 8; V = 1,640.82 Den(Calc)= 4.98
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/acd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.702(1), 1.6507(0.3), 2.35(0.15),

Physical Properties of Abswurmbachite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Dark brown.
Help on Density: Density: 4.96
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luster: Luster: Metallic
Help on Streak: Streak: brownish black

Optical Properties of Abswurmbachite

Help on Optical Data: Optical Data: NCalc= 2.37 - from Gladstone-Dale relationship (KC = 0.275) where Ncalc=Dcalc*KC+1
NCalc= 2.36 - from Gladstone-Dale relationship (KC = 0.275) where Ncalc=Dmeas*KC+1

Calculated Properties of Abswurmbachite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.70 gm/cc
note: Specific Gravity of Abswurmbachite =4.98 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0030503228
Boson Index = 0.9969496772
Help on Photoelectric: Photoelectric: PEAbswurmbachite = 18.79 barns/electron
U=PEAbswurmbachite x rElectron Density= 88.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Abswurmbachite is Not Radioactive

Abswurmbachite Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.05)where A B X2
  (07.05.01)Humite group (Tetragonal: I41/acd) containing Si Braunite-I MnMn6SiO12 I 41/acd 4/m 2/m 2/m Neltnerite CaMn6SiO12 I 41/acd 4/m 2/m 2/m Braunite-II* MnMn6SiO12 I 41/acd 4/m 2/m 2/m Abswurmbachite CuMn6SiO12 I 41/acd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AG.05 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AG -Nesosilicates with additional anions; cations in > [6] � [6] coordination
09.AG.05 Abswurmbachite CuMn6SiO12 I 41/acd 4/m 2/m 2/m
09.AG.05 Braunite-I MnMn6SiO12 I 41/acd 4/m 2/m 2/m
09.AG.05 Braunite-II* MnMn6SiO12 I 41/acd 4/m 2/m 2/m
09.AG.05 Neltnerite CaMn6SiO12 I 41/acd 4/m 2/m 2/m

Other Abswurmbachite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996)
Help on See Also: See Also: Links to other databases for Abswurmbachite :
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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Dana No: Strunz No: 09.AG.05





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