Abswurmbachite Mineral Data

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Abswurmbachite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Abswurmbachite :

A Bijoux Google Search for Abswurmbachite
Adam's Minerals Google Search for Abswurmbachite
Cape Minerals Google Search for Abswurmbachite
Dakota Matrix Minerals Google Search for Abswurmbachite
Excalibur Mineral Corp. Google Search for Abswurmbachite
Exceptional Minerals Google Search for Abswurmbachite
John Betts Fine Minerals Search for Abswurmbachite
McDougall Minerals Google Search for Abswurmbachite
Mineral News Website Link
Rock and Mineral Shows Google Search for Abswurmbachite
Weinrich Minerals, Inc. Google Search for Abswurmbachite

Ask about Abswurmbachite 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 Español

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: