Abswurmbachite Mineral Data

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General Abswurmbachite Information

Chemical Formula:

Cu++Mn+++6SiO12

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

Empirical Formula:

Cu_0.9Mn²⁺_0.2Mn³⁺_5.5Fe³⁺_0.4Al_0.1SiO₁₂

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

IMA1990-007

PDF 41-576

Abswurmbachite Image

Images:

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

Abswurmbachite Crystallography

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 DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/acd

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.702(1), 1.6507(0.3), 2.35(0.15),

Crystal Structure:

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Reinecke T , Tillmanns E , Bernhardt H J , Neues Jahrbuch fur Mineralogie, Abhandlungen , 163 (1991) p.117-143, Abswurmbachite, CuMn6[O8/SiO4], a new mineral of the braunite, group: natural occurrence, synthesis, and crystal structure

Physical Properties of Abswurmbachite

Cleavage:

None

Color:

Black, Dark brown.

Density:

4.96

Diaphaneity:

Opaque

Hardness:

6.5 - Pyrite

Luster:

Metallic

Streak:

brownish black

Optical Properties of Abswurmbachite

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

Electron Density:

Bulk Density (Electron Density)=4.70 gm/cc
note: Specific Gravity of Abswurmbachite =4.98 gm/cc.

Fermion Index:

Fermion Index = 0.0030503228
Boson Index = 0.9969496772

Photoelectric:

PE_{Abswurmbachite}= 18.79 barns/electron
U=PE_{Abswurmbachite} x rElectron Density= 88.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Abswurmbachite is Not Radioactive

Abswurmbachite Classification

Dana Class:

07.05.01.04 (07)Multiple Oxides

(07.05)where A B X2

(07.05.01)Humite group (Tetragonal: I41/acd) containing Si

07.05.01.01 Braunite-I MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

07.05.01.02 Neltnerite CaMn6SiO12 I 4₁/acd 4/m 2/m 2/m

07.05.01.03 Braunite-II* MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

07.05.01.04 Abswurmbachite CuMn6SiO12 I 4₁/acd 4/m 2/m 2/m

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

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 :

Abswurmbachite

Cu++Mn+++6SiO12
Dana No: 07.05.01.04 Strunz No: 09.AG.05
Locality:

Notes: