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.

Name Pronunciation:

Orebroite-VIII + Pronunciation

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.

Diaphaneity:

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
Ncalc = 1.98

Optical Data:

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

Calculated Properties of Orebroite-VIII

Electron Density:

Bulk Density (Electron Density)=4.33 gm/cc
note: Specific Gravity of Orebroite-VIII =4.61 gm/cc.

Fermion Index:

Fermion Index = 0.0051107
Boson Index = 0.9948893

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Orebroite-VIII is Not Radioactive

Orebroite-VIII Classification

Dana Class:

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

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

(52.04.01)Welinite group

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

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

52.04.01.03 Kittatinnyite Ca2Mn2MnSi2O8(OH)4•9(H2O) P 6₃/mmc 6/m 2/m 2/m

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

Strunz Class:

09.JA.05 09 - SILICATES (Germanates)

09.J - Germanates

09.JA -Germanates

09.JA.05 Carboirite-III FeAl2GeO5(OH)2 C1 1

09.JA.05 Carboirite-VIII Fe(Al,Ge)2O[(Ge,Si)O4](OH)2 C1 1

09.JA.05 Orebroite-VIII Mn3(Sb,Fe)SiO4(O,OH)3 P 3 3

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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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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: 52.04.01.01 Strunz No: 09.JA.05
Locality:

Notes: