Mcconnellite Mineral Data

General Mcconnellite Information

Chemical Formula:

CuCrO2

Composition:

Molecular Weight = 147.54 gm

Chromium 35.24 % Cr 51.51 % Cr₂O₃

Copper 43.07 % Cu 48.49 % Cu₂O

Oxygen 21.69 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CuCrO₂

Environment:

Alluvial pebbles intergrown with other chromium oxides.

IMA Status:

Approved IMA 1976

Locality:

Merume River, Mazaruni district, Guyana. Link to MinDat.org Location Data.

Name Origin:

Named for R. B. McConnell (1903-1986), British geologist.

Name Pronunciation:

Mcconnellite + Pronunciation

Synonym:

ICSD 26676

PDF 39-247

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Mcconnellite Crystallography

Axial Ratios:

a:c = 1:5.73506

Cell Dimensions:

a = 2.997, c = 17.188, Z = 3; V = 133.70 Den(Calc)= 5.50

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.47(1), 1.646(0.45), 2.85(0.4),

Physical Properties of Mcconnellite

Color:

Dark red.

Density:

5.49

Diaphaneity:

Opaque

Hardness:

5.5 - Knife Blade

Luster:

Metallic

Optical Properties of Mcconnellite

Optical Data:

NCalc= 2.45 - from Gladstone-Dale relationship (KC = 0.2628) where Ncalc=Dcalc*KC+1
NCalc= 2.44 - from Gladstone-Dale relationship (KC = 0.2628) where Ncalc=Dmeas*KC+1

Calculated Properties of Mcconnellite

Electron Density:

Bulk Density (Electron Density)=5.14 gm/cc
note: Specific Gravity of Mcconnellite =5.50 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Mcconnellite= 27.52 barns/electron
U=PE_Mcconnellite x rElectron Density= 141.58 barns/cc.

Radioactivity:

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

Mcconnellite Classification

Dana Class:

07.01.01.02 (07)Multiple Oxides

(07.01)where A B X2 containing copper

(07.01.01)Dana Group

07.01.01.01 Delafossite CuFeO2 R 3m 3 2/m

07.01.01.02 Mcconnellite CuCrO2 R 3m 3 2/m

Strunz Class:

04.AB.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.A - Metal:Oxygen = 2.1 and 1:1

04.AB -M:O = 1:1 (and up to 1:1.25); with small to medium-sized cations only

04.AB.15 Delafossite CuFeO2 R 3m 3 2/m

04.AB.15 Mcconnellite CuCrO2 R 3m 3 2/m

Other Mcconnellite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Mcconnellite :
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

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

Mcconnellite

CuCrO2
Dana No: 07.01.01.02 Strunz No: 04.AB.15
Locality:

Notes: