Wesselsite Mineral Data

Wesselsite Mineral Data +

General Wesselsite Information

Chemical Formula:

SrCu++Si4O10

Composition:

Molecular Weight = 423.50 gm

Strontium 20.69 % Sr 24.47 % SrO

Copper 15.00 % Cu 18.78 % CuO

Silicon 26.53 % Si 56.75 % SiO₂

Oxygen 37.78 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SrCuSi₄O₁₀

IMA Status:

Approved IMA 1994 (Dana # Added)

Locality:

Wessels mine, Kalahari Manganese field, Kuruman Hill, Cape Province, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

IMA1994-055

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Wesselsite Crystallography

Axial Ratios:

a:c = 1:2.1143

Cell Dimensions:

a = 7.366, c = 15.574, Z = 4; V = 845.01 Den(Calc)= 3.33

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/ncc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.33(1), 3.12(0.55), 3.03(0.5),

Crystal Structure:

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Chakoumakos B C , Fernandez-Baca J A , Boatner L A , Journal of Solid State Chemistry , 103 (1993) p.105-113, Refinement of the structures of the layer silicates MCuSi4O10 (M=Ca,Sr,Ba), by Rietveld analysis of neutron powder diffraction data, Note: gillespite structure, Locality: synthetic

Physical Properties of Wesselsite

Cleavage:

[001] Perfect

Color:

Blue.

Density:

3.2

Diaphaniety:

Transparent

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

blue white

Optical Properties of Wesselsite

Gladstone-Dale:

CI meas= -0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1832,KPDmeas= 0.1906,KC= 0.1854

Optical Data:

Uniaxial (-), e=1.59, w=1.63, bire=0.0400.

Calculated Properties of Wesselsite

Electron Density:

r_electron=3.19 gm/cc
note: r_Wesselsite=3.33 gm/cc.

Fermion Index

Fermion Index = 0.02705
Boson Index = 0.97295

Photoelectric:

PE_Wesselsite= 30.44 barns/electron
U=PE_Wesselsite x r_electron= 97.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wesselsite is Not Radioactive

Wesselsite Classification

Dana Class:

71.2.3.4 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.3)Cuprorivaite group

71.2.3.1 Cuprorivaite CaCuSi4O10 P 4/nnc 4/m 2/m 2/m

71.2.3.2 Gillespite BaFeSi4O10 P 4/ncc 4/m 2/m 2/m

71.2.3.3 Effenbergerite BaCuSi4O10 P 4/nnc 4/m 2/m 2/m

71.2.3.4 Wesselsite ! SrCuSi4O10 P 4/ncc 4/m 2/m 2/m

Strunz Class:

VIII/H.02-20 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.02 - Davanite - Dalyite series

VIII/H.02-10 Cuprorivaite CaCuSi4O10 P 4/nnc 4/m 2/m 2/m

VIII/H.02-20 Wesselsite SrCuSi4O10 P 4/ncc 4/m 2/m 2/m

VIII/H.02-30 Effenbergerite BaCuSi4O10 P 4/nnc 4/m 2/m 2/m

VIII/H.02-40 Gillespite BaFeSi4O10 P 4/ncc 4/m 2/m 2/m

VIII/H.02-50 Sanbornite BaSi2O5 Pmnb 2/m 2/m 2/m

VIII/H.02-60 Bigcreekite! BaSi2O5·4(H2O) P nma 2/m 2/m 2/m

Other Wesselsite Information

References:

PHYS. PROP.(Min.Mag.,Vol.60,p795,1996) OPTIC PROP.(Min.Mag.,Vol.60,p795,1996)

See Also:

Links to other databases for Wesselsite :
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 10 - WWW-MINCRYST

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Print or Cut-and-Paste your Wesselsite Specimen Label here :

Wesselsite

SrCu++Si4O10
Dana No: 71.2.3.4 Strunz No: VIII/H.02-20
Locality:

Notes: