Effenbergerite Mineral Data

General Effenbergerite Information

Chemical Formula:

BaCuSi4O10

Composition:

Molecular Weight = 473.21 gm

Barium 29.02 % Ba 32.40 % BaO

Copper 13.43 % Cu 16.81 % CuO

Silicon 23.74 % Si 50.79 % SiO₂

Oxygen 33.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaCuSi₄O₁₀

Environment:

In a matrix consisting primarily of braunite, sugilite, and hausmannite, cut by pectolite veinlets. Ba-analog to cuprorivaite and Cu-analog to gillespite.

IMA Status:

Approved IMA 1994

Locality:

Central-eastern orebody of the Wessels mine, Kalahari Manganese Field, NW Cape Province, Republic of South Africa. Link to MinDat.org Location Data.

Name Origin:

Named after Dr. Herta S. Effenberger, mineralogist and crystallographer of the University of Vienna.

Name Pronunciation:

Effenbergerite + Pronunciation

Synonym:

ICSD 75970

IMA1993-036

PDF 47-1779

Effenbergerite Image

Images:

Click Here for Larger Effenbergerite Image

Effenbergerite Sugilite

Comments: Blue effenbergerite pods to across in massive purple sugilite.
Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: Crystal size 4 mm.
© John Veevaert

Effenbergerite Crystallography

Axial Ratios:

a:c = 1:2.16783

Cell Dimensions:

a = 7.442, c = 16.133, Z = 4; V = 893.50 Den(Calc)= 3.52

Crystal System:

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

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

By Intensity(I/I_o): 8.0624(1), 3.1998(0.44), 2.3943(0.41),

Forms:

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Forms: ( 1 0 0) ( 1 1 0) ( 0 0 1) ( 1 0 2)

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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 Effenbergerite

Cleavage:

{001} Perfect, {110} Poor

Color:

Blue.

Density:

3.57 - 3.52, Average = 3.54

Diaphaneity:

Transparent

Fracture:

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

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Streak:

pale blue

Optical Properties of Effenbergerite

Dichroism (e):

pale blue.

Dichroism (w):

intense blue.

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1741,KPDmeas= 0.1729,KC= 0.1757
Ncalc = 1.62 - 1.63

Optical Data:

Uniaxial (-), e=1.593, w=1.633, bire=0.0400.

Calculated Properties of Effenbergerite

Electron Density:

Bulk Density (Electron Density)=3.29 gm/cc
note: Specific Gravity of Effenbergerite =3.52 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Effenbergerite}= 131.55 barns/electron
U=PE_{Effenbergerite} x rElectron Density= 432.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Effenbergerite is Not Radioactive

Effenbergerite Classification

Dana Class:

71.02.03.03 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.02)with 2:1 Layers

(71.02.03)Cuprorivaite group

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

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

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

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

Strunz Class:

09.EA.05 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

09.EA.05 Cuprorivaite CaCuSi4O10 P 4/nnc 4/m 2/m 2/m

09.EA.05 Effenbergerite BaCuSi4O10 P 4/nnc 4/m 2/m 2/m

09.EA.05 Gillespite BaFeSi4O10 P 4/ncc 4/m 2/m 2/m

09.EA.05 Wesselsite! SrCuSi4O10 P 4/ncc 4/m 2/m 2/m

Other Effenbergerite Information

References:

NAME( MinRec) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Effenbergerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Effenbergerite

BaCuSi4O10
Dana No: 71.02.03.03 Strunz No: 09.EA.05
Locality:

Notes: