Orebroite-III Mineral Data

General Orebroite-III Information

Chemical Formula:

Mn++6(Fe+++,Sb+++++)2Si2(O,OH)14

Composition:

Molecular Weight = 756.45 gm

Manganese 43.58 % Mn 56.27 % MnO

Iron 11.07 % Fe 14.25 % FeO

Silicon 7.43 % Si 15.89 % SiO₂

Antimony 8.05 % Sb 9.63 % Sb₂O₃

Hydrogen 0.27 % H 2.38 % H₂O

Oxygen 29.61 % O

______ ______

100.00 % 98.41 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₆Fe²⁺_1.5Sb_0.5Si₂O₁₂(OH)₂

Environment:

In a manganese deposit with dolomite and hausmannite.

IMA Status:

Approved IMA 1986

Locality:

Sjogruvan, Grythyttan, Orebro, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Orebroite-III + Pronunciation

Synonym:

Oerebroite

Orebroite-III Crystallography

Axial Ratios:

a:c = 1:0.5812

Cell Dimensions:

a = 8.183, c = 4.756, Z = 1; V = 275.80 Den(Calc)= 4.55

Crystal System:

Trigonal - Pyramidal H-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-III

Cleavage:

None

Color:

Dark brown.

Density:

4.77

Diaphaneity:

Transparent to Translucent

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Magnetism:

Slightly magnetic

Streak:

reddish brown

Optical Properties of Orebroite-III

Gladstone-Dale:

CI meas= 0.085 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1903,KPDmeas= 0.1816,KC= 0.1983
Ncalc = 1.9 - 1.95

Optical Data:

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

Calculated Properties of Orebroite-III

Electron Density:

Bulk Density (Electron Density)=4.29 gm/cc
note: Specific Gravity of Orebroite-III =4.55 gm/cc.

Fermion Index:

Fermion Index = 0.0059579947
Boson Index = 0.9940420053

Photoelectric:

PE_{Orebroite-III}= 40.24 barns/electron
U=PE_{Orebroite-III} x rElectron Density= 172.56 barns/cc.

Radioactivity:

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

Orebroite-III Classification

Dana Class:

07.03.01.03 (07)Multiple Oxides

(07.03)with 2+ and higher charged cations

(07.03.01)containing Mn (Hexagonal, P3)

07.03.01.01 Welinite-III Mn6(W,Mg)2Si2(O,OH)14 P 3 3

07.03.01.02 Franciscanite-III Mn6V2Si2(O,OH)14 P 3 3

07.03.01.03 Orebroite-III Mn6(Fe,Sb)2Si2(O,OH)14 P 3 3

Strunz Class:

09.AF.07.5 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AF -Nesosilicates with additional anions;

09.AF.07.5 Franciscanite-III Mn6V2Si2(O,OH)14 P 3 3

09.AF.07.5 Franciscanite-VIII Mn3(V,[])1-x(SiO4)(O,OH)3(x=0.5) P 3 3

09.AF.07.5 Orebroite-III Mn6(Fe,Sb)2Si2(O,OH)14 P 3 3

09.AF.07.5 Welinite-III Mn6(W,Mg)2Si2(O,OH)14 P 3 3

09.AF.07.5 Welinite-VIII (Mn,Mg)3(W,Mn)1-x(SiO4)(O,OH)3(x=1/3) P 3 3

Other Orebroite-III Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Orebroite-III :
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-III Specimen Label here :

Orebroite-III

Mn++6(Fe+++,Sb+++++)2Si2(O,OH)14
Dana No: 07.03.01.03 Strunz No: 09.AF.07.5
Locality:

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