Welinite-VIII Mineral Data (original) (raw)

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

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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 - PyramidalH-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:

52.04.01.02 (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

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

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

52.04.01.03 Kittatinnyite Ca2Mn2MnSi2O8(OH)4•9(H2O) P 63/mmc 6/m 2/m 2/m

52.04.01.04 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 :

Welinite-VIII

(Mn++,Mg)3(W++++++,Mn+++)1-x(SiO4)(O,OH)3 (x=1/3)
Dana No: 52.04.01.02 Strunz No: 09.AF.07.5
Locality:

Notes: