Mineralogy Database

Welinite-III Mineral Data

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General Welinite-III Information

Help on Chemical  Formula: Chemical Formula: Mn++6(W++++++,Mg)2Si2(O,OH)14
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+6W1.5Mg0.5Si2O12(OH)2
Help on Environment: Environment: Fillings in fessures with other minerals cutting hausmannite ore.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Langban, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Eric Welin, mineralogist and geochronologist, Swedish Museum of Natural History, Stockholm, Sweden.
Help on Name Pronunciation: Name Pronunciation: Welinite-III Say WELINITE-III

Welinite-III Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.58675
Help on Cell Dimensions: Cell Dimensions: a = 8.155, c = 4.785, Z = 1; V = 275.59 Den(Calc)= 5.42
Help on Crystal System: Crystal System: Trigonal - Pyramidal H-M Symbol (3) Space Group: P 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.782(1), 2.332(0.8), 3.102(0.8),

Physical Properties of Welinite-III

Help on Color: Color: Brown, Reddish black.
Help on Density: Density: 4.47
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Resinous

Optical Properties of Welinite-III

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.864, e=1.88, bire=0.0160.

Calculated Properties of Welinite-III

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.06 gm/cc
note: Specific Gravity of Welinite-III =4.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEWelinite-III = 373.99 barns/electron
U=PEWelinite-III x rElectron Density=1,519.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Welinite-III is Not Radioactive

Welinite-III Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.03)with 2+ and higher charged cations
  (07.03.01)containing Mn (Hexagonal, P3) Welinite-III Mn6(W,Mg)2Si2(O,OH)14 P 3 3 Franciscanite-III Mn6V2Si2(O,OH)14 P 3 3 Orebroite-III Mn6(Fe,Sb)2Si2(O,OH)14 P 3 3
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 09.AF.07.5





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