Orebroite-III Mineral Data

Orebroite-III Mineral Data +

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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.

Synonym:

Oerebroite

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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 - 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-III

Cleavage:

None

Color:

Dark brown.

Density:

4.77

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Orebroite-III

Electron Density:

r_electron=4.29 gm/cc
note: r_{Orebroite-III}=4.55 gm/cc.

Fermion Index

Fermion Index = 0.00595
Boson Index = 0.99405

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orebroite-III is Not Radioactive

Orebroite-III Classification

Dana Class:

7.3.1.3 (7)Multiple Oxides

(7.3)with 2+ and higher charged cations

(7.3.1)containing Mn (Hexagonal, P3)

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

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

7.3.1.3 Orebroite-III Mn6(Fe,Sb)2Si2(O,OH)14 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-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 -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-III Specimen Label here :

Orebroite-III

Mn++6(Fe+++,Sb+++++)2Si2(O,OH)14
Dana No: 7.3.1.3 Strunz No: VIII/B.09-12*
Locality:

Notes: