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Mcconnellite

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Formula:
CuCrO2
Hardness:
Crystal System:
Trigonal
Name:
Named in 1967 by Charles Milton, Daniel E. Appleman, Edward Ching-Te Chao, Frank Cuttita, Joseph I. Dinnin, Edward J. Dwornik, Margaret Hall, Blanche L. Ingram, and Harry J. Rose, Jr. in honor of Dr. Richard Bradford McConnell (27 December 1903, Ottawa, Ontario, Canada - 6 August 1986, Sussex, England), former Director, British Guyana Geological Survey.
As with other Cr mineral species from the Merume River locality, such as bracewellite, grimaldiite, and guyanaite, this species is NOT universally present in every specimen and verification of each specimen is required.


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Classification of McconnelliteHide

Approved
4.AB.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
A : Metal: Oxygen = 2:1 and 1:1
B : M:O = 1:1 (and up to 1:1.25); with small to medium-sized cations only
7.1.1.2

7 : MULTIPLE OXIDES
1 : ABX2
7.14.7

7 : Oxides and Hydroxides
14 : Oxides of Cr

Physical Properties of McconnelliteHide

Hardness:
5½ on Mohs scale

Chemical Properties of McconnelliteHide

Formula:
CuCrO2
IMA Formula:
Cu1+CrO2

Crystallography of McconnelliteHide

Crystal System:
Trigonal
Cell Parameters:
a = 2.97 Å, c = 17.11 Å
Ratio:
a:c = 1 : 5.761
Unit Cell V:
130.71 ų (Calculated from Unit Cell)

Type Occurrence of McconnelliteHide

Synonyms of McconnelliteHide

Other Language Names for McconnelliteHide

Relationship of Mcconnellite to other SpeciesHide

Other Members of this group:
DelafossiteCuFeO2Trig. 3m (3 2/m)
Structurally related to group(s):

Common AssociatesHide

Associated Minerals Based on Photo Data:
Grimaldiite3 photos of Mcconnellite associated with Grimaldiite on mindat.org.
Eskolaite1 photo of Mcconnellite associated with Eskolaite on mindat.org.
Gold1 photo of Mcconnellite associated with Gold on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.AB.Carbon Monoxide IceCO
4.AB.05CredneriteCuMnO2Mon. 2/m : B2/m
4.AB.10TenoriteCuOMon. 2/m : B2/b
4.AB.15DelafossiteCuFeO2Trig. 3m (3 2/m)
4.AB.20BromelliteBeOHex. 6mm : P63mc
4.AB.20ZinciteZnOHex. 6mm : P63mc
4.AB.25BunseniteNiOIso. m3m (4/m 3 2/m) : Fm3m
4.AB.25LimeCaOIso. m3m (4/m 3 2/m)
4.AB.25ManganositeMnOIso. m3m (4/m 3 2/m) : Fm3m
4.AB.25MonteponiteCdOIso. m3m (4/m 3 2/m) : Fm3m
4.AB.25PericlaseMgOIso. m3m (4/m 3 2/m) : Fm3m
4.AB.25WüstiteFeOIso. m3m (4/m 3 2/m) : Fm3m
4.AB.30PalladinitePdOTet.

Related Minerals - Dana Grouping (8th Ed.)Hide

7.1.1.1DelafossiteCuFeO2Trig. 3m (3 2/m)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.14.1EskolaiteCr2O3Trig.
7.14.2BracewelliteCrO(OH)Orth. mmm (2/m 2/m 2/m)
7.14.3GrimaldiiteCrO(OH)Trig.
7.14.4GuyanaiteCrO(OH)Orth.
7.14.5YimengiteK(Cr,Ti,Fe,Mg)12O19Hex.
7.14.6Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38Trig.
7.14.8RedledgeiteBa(Ti4+6Cr3+2)O16Tet.
7.14.9HawthorneiteBaMgTi3Cr4Fe2+2Fe3+2O19Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.14.10ZincochromiteZnCr2O4Iso.
7.14.11Wattersite(Hg+2)2Hg2+(CrO4)O2Mon. 2/m : B2/b
7.14.12ChromiteFe2+Cr3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.14.13MagnesiochromiteMgCr2O4Iso. m3m (4/m 3 2/m) : Fd3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for McconnelliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Milton, C., Appleman, D.E., Appleman, M.H., Chao, E.C.T., Cuttitta, F.,
Dinnin, J.I., Dwornik, E.J., Ingram, B.L., Rose, Jr., H.J. (1976) Merumite – a complex assemblage of chromium minerals from Guyana. U.S. Geological Survey Professional Paper 887: 1–29.
Geological Society of America, Program for Annual Meeting (1967) p. 151.
Fleischer, M., Cabri, L.J., Nickel, E.H., Pabst, A. (1977) New mineral names. American Mineralogist: 62: 593-600.
Dannhauser, W., Vaughan, P.A. (1955) The crystal structure of cuprous chromite. Journal of the American Chemical Society: 77: 896-897.

Internet Links for McconnelliteHide

Localities for McconnelliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Guyana (TL)
 
  • Mazaruni District
    • Kamakusa
Geol.Soc.Amer.,Progr.Ann. Meeting (1967) p. 151; MINERALOGICAL MAGAZINE, DECEMBER 1984, VOL. 48, PP. 560 2
Namibia
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Ettler, V., Johan, Z., Kříbek, B., Šebek, O. & Mihaljevič, M. (2009): Mineralogy and environmental stability of slags from the Tsumeb smelter, Namibia. Applied Geochemistry 24, 1-15.
Mineral and/or Locality  
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