Abswurmbachite Mineral Data

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.

Synonym:

ICSD 71823

IMA1990-007

PDF 41-576

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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

Diaphaniety:

Opaque

Hardness:

6.5 - Pyrite

Luster:

Metallic

Streak:

brownish black

Optical Properties of Abswurmbachite

Optical Data:

NCalc= 2.35 - from Gladstone-Dale relationship (KC = 0.2705) where Ncalc=Dcalc*KC+1
NCalc= 2.34 - from Gladstone-Dale relationship (KC = 0.2705) where Ncalc=Dmeas*KC+1

Calculated Properties of Abswurmbachite

Electron Density:

r_electron=4.70 gm/cc
note: r_{Abswurmbachite}=4.98 gm/cc.

Fermion Index

Fermion Index = 0.00305
Boson Index = 0.99695

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Abswurmbachite is Not Radioactive

Abswurmbachite Classification

Dana Class:

7.5.1.4 (7)Multiple Oxides

(7.5)where A B X2

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

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

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

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

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

Strunz Class:

VIII/B.09-05 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.09 - Braunite - Langbanite - Katoptrite series

VIII/B.09-03 Braunite-I MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-05 Abswurmbachite CuMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-07 Neltnerite CaMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-10* Franciscanite-III Mn6V2Si2(O,OH)14 P 3 3

VIII/B.09-10 Franciscanite-VIII Mn3(V,[])1-x(SiO4)(O,OH)3(x=0.5) P 3 3

VIII/B.09-12* Orebroite-III Mn6(Fe,Sb)2Si2(O,OH)14 P 3 3

VIII/B.09-12 Orebroite-VIII Mn3(Sb,Fe)SiO4(O,OH)3 P 3 3

VIII/B.09-14* Welinite-III Mn6(W,Mg)2Si2(O,OH)14 P 3 3

VIII/B.09-14 Welinite-VIII (Mn,Mg)3(W,Mn)1-x(SiO4)(O,OH)3(x=1/3) P 3 3

VIII/B.09-17 Langbanite (Mn,Ca,Fe)4(Mn,Fe)9SbSi2O24 C 2/m 2/m

VIII/B.09-20 Yeatmanite Mn9Zn6Sb2Si4O28 P1 1

VIII/B.09-30 Katoptrite (Mn,Mg)13(Al,Fe)4Sb2Si2O28 C 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Abswurmbachite

Cu++Mn+++6SiO12
Dana No: 7.5.1.4 Strunz No: VIII/B.09-05
Locality:

Notes: