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Abswurmbachite Mineral Data
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General Abswurmbachite Information
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 Chemical Formula: |
Cu++Mn+++6SiO12 |
| Composition: |
Molecular Weight = 615.45 gm |
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Manganese 50.88 % Mn 2.31 % MnO / 70.54 % Mn2O3 |
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Aluminum 0.44 % Al 0.83 % Al2O3 |
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Iron 3.63 % Fe 5.19 % Fe2O3 |
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Copper 9.29 % Cu 11.63 % CuO |
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Silicon 4.56 % Si 9.76 % SiO2 |
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Oxygen 31.20 % O |
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______ ______ |
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100.00 % 100.26 % = TOTAL OXIDE |
| Empirical Formula: |
Cu0.9Mn2+0.2Mn3+5.5Fe3+0.4Al0.1SiO12 |
| Environment: |
In very low-grade, high pressure metamorphic Mn, Al-rich sediments. |
| IMA Status: |
Approved IMA 1991 |
| Locality: |
Milli, Avia and Andros Island, Greece. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Irmgard Abs-Wurmbach (1938-), German mineralogist. |
| Name Pronunciation: |
Abswurmbachite + Pronunciation  |
| Synonym: |
ICSD 71823 |
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IMA1990-007 |
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PDF 41-576 |
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Abswurmbachite Image |
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Images:
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Abswurmbachite
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 |
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Abswurmbachite Crystallography
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| Axial Ratios: |
a:c = 1:1.97172 |
| Cell Dimensions: |
a = 9.406, c = 18.546, Z = 8; V = 1,640.82 Den(Calc)= 4.98 |
| Crystal System: |
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/acd |
| X Ray Diffraction: |
By Intensity(I/Io): 2.702(1), 1.6507(0.3), 2.35(0.15), |
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Physical Properties of Abswurmbachite
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| Cleavage: |
None |
| Color: |
Black, Dark brown. |
| Density: |
4.96 |
| Diaphaneity: |
Opaque |
| Hardness: |
6.5 - Pyrite |
| Luster: |
Metallic |
| Streak: |
brownish black |
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Optical Properties of Abswurmbachite
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| 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 |
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Calculated Properties of Abswurmbachite
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| Electron Density: |
Bulk Density (Electron Density)=4.70 gm/cc
note: Specific Gravity of Abswurmbachite =4.98 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0030503228
Boson Index = 0.9969496772 |
| Photoelectric: |
PEAbswurmbachite = 18.79 barns/electron
U=PEAbswurmbachite x rElectron Density= 88.29 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Abswurmbachite is Not Radioactive |
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Abswurmbachite Classification
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| Dana Class: |
07.05.01.04 (07)Multiple Oxides |
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(07.05)where A B X2 |
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(07.05.01)Humite group (Tetragonal: I41/acd) containing Si |
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07.05.01.01 Braunite-I MnMn6SiO12 I 41/acd 4/m 2/m 2/m |
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07.05.01.02 Neltnerite CaMn6SiO12 I 41/acd 4/m 2/m 2/m |
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07.05.01.03 Braunite-II* MnMn6SiO12 I 41/acd 4/m 2/m 2/m |
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07.05.01.04 Abswurmbachite CuMn6SiO12 I 41/acd 4/m 2/m 2/m |
| Strunz Class: |
09.AG.05 09 - SILICATES (Germanates) |
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09.A - Nesosilicates |
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09.AG -Nesosilicates with additional anions; cations in > [6] � [6] coordination |
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09.AG.05 Abswurmbachite CuMn6SiO12 I 41/acd 4/m 2/m 2/m |
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09.AG.05 Braunite-I MnMn6SiO12 I 41/acd 4/m 2/m 2/m |
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09.AG.05 Braunite-II* MnMn6SiO12 I 41/acd 4/m 2/m 2/m |
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09.AG.05 Neltnerite CaMn6SiO12 I 41/acd 4/m 2/m 2/m |
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Other Abswurmbachite Information
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| References: |
NAME( AntBidBlaNic2) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) |
| 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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Print or Cut-and-Paste your Abswurmbachite Specimen Label here :
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Abswurmbachite
Cu++Mn+++6SiO12
Dana No: 07.05.01.04 Strunz No: 09.AG.05
Locality:
Notes:
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