Cuprorivaite Mineral Data

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General Cuprorivaite Information

Chemical Formula:

CaCuSi4O10

Composition:

Molecular Weight = 375.96 gm

Calcium 10.66 % Ca 14.92 % CaO

Copper 16.90 % Cu 21.16 % CuO

Silicon 29.88 % Si 63.93 % SiO₂

Oxygen 42.56 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaCuSi₄O₁₀

Environment:

Intimately mixed with quartz (Vesuvius, Italy); in a mudstone xenolith ejected from a scoria cone (Sattelberg volcanic cone, Germany).

IMA Status:

Valid Species (Pre-IMA) 1938

Locality:

Vesuvius, Italy Link to MinDat.org Location Data.

Name Origin:

Named for a high copper content and presumed similarity to rivaite.

Synonym:

ICSD 72612

PDF 12-512

Cuprorivaite Image

Images:

Cuprorivaite

Comments: Pale blue grains of cuprorivaite.
Location: Vesuvius, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cuprorivaite Crystallography

Axial Ratios:

a:c = 1:2.07123

Cell Dimensions:

a = 7.3, c = 15.12, Z = 4; V = 805.74 Den(Calc)= 3.10

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): 3.29(1), 3(0.9), 3.78(0.9),

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 Cuprorivaite

Cleavage:

{001} Perfect

Color:

Blue.

Density:

3.08

Diaphaneity:

Transparent

Fracture:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

light blue

Optical Properties of Cuprorivaite

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1973,KPDmeas= 0.1985,KC= 0.2003
Ncalc = 1.62

Optical Data:

Uniaxial (-), e=1.59, w=1.633, bire=0.0430.

Calculated Properties of Cuprorivaite

Electron Density:

Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Cuprorivaite =3.08 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Cuprorivaite= 9.72 barns/electron
U=PE_Cuprorivaite x rElectron Density= 29.45 barns/cc.

Radioactivity:

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

Cuprorivaite Classification

Dana Class:

71.02.03.01 (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 Cuprorivaite 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 Cuprorivaite :
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 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Cuprorivaite

CaCuSi4O10
Dana No: 71.02.03.01 Strunz No: 09.EA.05
Locality:

Notes: