Mineralogy Database

Welinite-VIII Mineral Data

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General Welinite-VIII Information

Help on Chemical  Formula: Chemical Formula: (Mn++,Mg)3(W++++++,Mn+++)1-x(SiO4)(O,OH)3 (x=1/3)
Help on Composition: Composition: Molecular Weight = 402.69 gm
   Magnesium   1.21 %  Mg    2.00 % MgO
   Manganese  40.93 %  Mn   52.85 % MnO
   Silicon     6.97 %  Si   14.92 % SiO2
   Hydrogen    0.25 %  H     2.24 % H2O
   Tungsten   22.83 %  W    28.79 % WO3
   Oxygen     27.81 %  O
             ______        ______ 
             100.00 %      100.79 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+3W0.5Mg0.2SiO6(OH)
Help on Environment: Environment: In small amounts, as fillings in fissures with other mineral 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-VIII Say WELINITE-VIII

Welinite-VIII 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 = 2; V = 275.59 Den(Calc)= 4.85
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-VIII

Help on Cleavage: Cleavage: {001} Poor
Help on Color: Color: Brown, Reddish black.
Help on Density: Density: 4.47
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Resinous
Help on Streak: Streak: pale reddish brown

Optical Properties of Welinite-VIII

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.083 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1798,KPDmeas= 0.1951,KC= 0.196
Ncalc = 1.88 - 1.95
Help on Optical Data: Optical Data: Uniaxial (+), w=1.864, e=1.88, bire=0.0160.

Calculated Properties of Welinite-VIII

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.12 gm/cc
note: Specific Gravity of Welinite-VIII =4.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEWelinite-VIII = 278.78 barns/electron
U=PEWelinite-VIII x rElectron Density=1,147.45 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Welinite-VIII is Not Radioactive

Welinite-VIII Classification

Help on  Dana Class: Dana Class: (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 Orebroite-VIII Mn3(Sb,Fe)SiO4(O,OH)3 P 3 3 Welinite-VIII (Mn,Mg)3(W,Mn)1-x(SiO4)(O,OH)3(x=1/3) P 3 3 Kittatinnyite Ca2Mn2MnSi2O8(OH)4•9(H2O) P 63/mmc 6/m 2/m 2/m Franciscanite-VIII Mn3(V,[])1-x(SiO4)(O,OH)3(x=0.5) 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-VIII Information

Help on References: References: NAME( AntBidBlaNic2) 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-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 Welinite-VIII Specimen Label here :


(Mn++,Mg)3(W++++++,Mn+++)1-x(SiO4)(O,OH)3 (x=1/3)
Dana No: Strunz No: 09.AF.07.5





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