Welinite-VIII Mineral Data

Welinite-VIII Mineral Data +

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General Welinite-VIII Information

Chemical Formula:

(Mn++,Mg)3(W++++++,Mn+++)1-x(SiO4)(O,OH)3 (x=1/3)

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

Empirical Formula:

Mn²⁺₃W_0.5Mg_0.2SiO₆(OH)

Environment:

In small amounts, as fillings in fissures with other mineral 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.

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Welinite-VIII Crystallography

Axial Ratios:

a:c = 1:0.58675

Cell Dimensions:

a = 8.155, c = 4.785, Z = 2; V = 275.59 Den(Calc)= 4.85

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-VIII

Cleavage:

[001] Poor

Color:

Brown, Reddish black.

Density:

4.47

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4 - Fluorite

Luster:

Resinous

Streak:

pale reddish brown

Optical Properties of Welinite-VIII

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

Optical Data:

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

Calculated Properties of Welinite-VIII

Electron Density:

r_electron=4.12 gm/cc
note: r_{Welinite-VIII}=4.47 gm/cc.

Fermion Index

Fermion Index = 0.03719
Boson Index = 0.96281

Photoelectric:

PE_{Welinite-VIII}= 278.78 barns/electron
U=PE_{Welinite-VIII} x r_electron=1,147.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Welinite-VIII is Not Radioactive

Welinite-VIII Classification

Dana Class:

52.4.1.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.1)Welinite group

52.4.1.1 Orebroite-VIII Mn3(Sb,Fe)SiO4(O,OH)3 P 3 3

52.4.1.2 Welinite-VIII (Mn,Mg)3(W,Mn)1-x(SiO4)(O,OH)3(x=1/3) P 3 3

52.4.1.3 Kittatinnyite Ca2Mn2MnSi2O8(OH)4·9(H2O) P 6₃/mmc 6/m 2/m 2/m

52.4.1.4 Franciscanite-VIII Mn3(V,[])1-x(SiO4)(O,OH)3(x=0.5) 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-VIII Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Welinite-VIII :
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-VIII

(Mn++,Mg)3(W++++++,Mn+++)1-x(SiO4)(O,OH)3 (x=1/3)
Dana No: 52.4.1.2 Strunz No: VIII/B.09-14
Locality:

Notes: