Welinite-III Mineral Data

General Welinite-III Information

Chemical Formula:

Mn++6(W++++++,Mg)2Si2(O,OH)14

Composition:

Molecular Weight = 899.73 gm

Magnesium 1.35 % Mg 2.24 % MgO

Manganese 36.64 % Mn 47.31 % MnO

Silicon 6.24 % Si 13.36 % SiO₂

Hydrogen 0.22 % H 2.00 % H₂O

Tungsten 30.65 % W 38.65 % WO₃

Oxygen 24.90 % O

______ ______

100.00 % 103.56 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₆W_1.5Mg_0.5Si₂O₁₂(OH)₂

Environment:

Fillings in fessures with other minerals cutting hausmannite ore.

IMA Status:

Approved IMA 1967

Locality:

Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Eric Welin, mineralogist and geochronologist, Swedish Museum of Natural History, Stockholm, Sweden.

Name Pronunciation:

Welinite-III

Welinite-III Crystallography

Axial Ratios:

a:c = 1:0.58675

Cell Dimensions:

a = 8.155, c = 4.785, Z = 1; V = 275.59 Den(Calc)= 5.42

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): 1.782(1), 2.332(0.8), 3.102(0.8),

Physical Properties of Welinite-III

Color:

Brown, Reddish black.

Density:

4.47

Diaphaneity:

Transparent to Translucent

Hardness:

4 - Fluorite

Luster:

Resinous

Optical Properties of Welinite-III

Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.189 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1609,KPDmeas= 0.1951,KC= 0.1984
Ncalc = 1.89 - 2.08

Optical Data:

Uniaxial (+), w=1.864, e=1.88, bire=0.0160.

Calculated Properties of Welinite-III

Electron Density:

Bulk Density (Electron Density)=4.06 gm/cc
note: Specific Gravity of Welinite-III =4.47 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Welinite-III= 373.99 barns/electron
U=PE_Welinite-III x rElectron Density=1,519.86 barns/cc.

Radioactivity:

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

Welinite-III Classification

Dana Class:

07.03.01.01 (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 Welinite-III Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

Welinite-III

Mn++6(W++++++,Mg)2Si2(O,OH)14
Dana No: 07.03.01.01 Strunz No: 09.AF.07.5
Locality:

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