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 % H2 O
Tungsten 30.65 % W 38.65 % WO3
Oxygen 24.90 % O
______ ______
100.00 % 103.56 % = TOTAL OXIDE
Empirical Formula:
Mn2+ 6 W1.5 Mg0.5 Si2 O12 (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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEWelinite-III = 373.99 barns/electronU=PEWelinite-III x r Electron 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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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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