Welinite-III Mineral Data

Welinite-III Mineral Data +

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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

IMA Status:

Approved IMA 1967

Locality:

Link to MinDat.org Location Data.

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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 - PyramidalH-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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Welinite-III

Electron Density:

r_electron=4.06 gm/cc
note: r_Welinite-III=4.47 gm/cc.

Fermion Index

Fermion Index = 0.04815
Boson Index = 0.95185

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Welinite-III is Not Radioactive

Welinite-III Classification

Dana Class:

7.3.1.1 (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.09-14* 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 Welinite-III Information

References:

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Welinite-III

Mn++6(W++++++,Mg)2Si2(O,OH)14
Dana No: 7.3.1.1 Strunz No: VIII/B.09-14*
Locality:

Notes: