Orebroite-VIII Mineral Data

Orebroite-VIII Mineral Data +

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General Orebroite-VIII Information

Chemical Formula:

Mn++3(Sb+++++,Fe+++)SiO4(O,OH)3

Composition:

Molecular Weight = 383.03 gm

Manganese 43.03 % Mn 55.56 % MnO

Iron 7.29 % Fe 10.42 % Fe₂O₃

Silicon 7.33 % Si 15.69 % SiO₂

Antimony 12.71 % Sb 16.89 % Sb₂O₅

Hydrogen 0.39 % H 3.53 % H₂O

Oxygen 29.24 % O

______ ______

100.00 % 102.09 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₃Fe³⁺_0.5Sb_0.4(SiO₄)O_1.5(OH)_1.5

Environment:

Fine grained aggregate in antimonates.

IMA Status:

Approved IMA 1986

Locality:

At the Sjo mine, near Grythyttan, Orebro, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

Oerebroite

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Orebroite-VIII Crystallography

Axial Ratios:

a:c = 1:0.5812

Cell Dimensions:

a = 8.183, c = 4.756, Z = 2; V = 275.80 Den(Calc)= 4.61

Crystal System:

Trigonal - PyramidalH-M Symbol (3) Space Group: P 3

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

By Intensity(I/I_o): 3.096(1), 1.778(0.9), 2.334(0.7),

Physical Properties of Orebroite-VIII

Color:

Brown.

Diaphaniety:

Transparent to Translucent

Fracture:

Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Magnetism:

Weakly magnetic

Streak:

reddish brown

Optical Properties of Orebroite-VIII

Gladstone-Dale:

CI calc= 0.117 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1879,KC= 0.2128

Optical Data:

Uniaxial (+), w=1.857, e=1.875, bire=0.0180.

Calculated Properties of Orebroite-VIII

Electron Density:

r_electron=4.33 gm/cc
note: r_{Orebroite-VIII}=4.61 gm/cc.

Fermion Index

Fermion Index = 0.00511
Boson Index = 0.99489

Photoelectric:

PE_{Orebroite-VIII}= 53.67 barns/electron
U=PE_{Orebroite-VIII} x r_electron= 232.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orebroite-VIII is Not Radioactive

Orebroite-VIII Classification

Dana Class:

52.4.1.1 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.1)Welinite group

52.4.1.1 Orebroite-VIII Mn3(Sb,Fe)SiO4(O,OH)3 P 3 3

52.4.1.2 Welinite-VIII (Mn,Mg)3(W,Mn)1-x(SiO4)(O,OH)3(x=1/3) P 3 3

52.4.1.3 Kittatinnyite Ca2Mn2MnSi2O8(OH)4·9(H2O) P 6₃/mmc 6/m 2/m 2/m

52.4.1.4 Franciscanite-VIII Mn3(V,[])1-x(SiO4)(O,OH)3(x=0.5) P 3 3

Strunz Class:

VIII/B.09-12 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 Orebroite-VIII Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Orebroite-VIII :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Orebroite-VIII Specimen Label here :

Orebroite-VIII

Mn++3(Sb+++++,Fe+++)SiO4(O,OH)3
Dana No: 52.4.1.1 Strunz No: VIII/B.09-12
Locality:

Notes: