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Mcconnellite

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Formula:
Cu1+CrO2
System:
Trigonal
Hardness:
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 [1903 Ottawa, Canada - Aug. 6, 1986 Sussex, Egland], 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.


Classification of Mcconnellite

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 Mcconnellite

Hardness (Mohs):

Chemical Properties of Mcconnellite

IMA Formula:
Cu1+CrO2
Elements listed in formula:

Crystallography of Mcconnellite

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

Type Occurrence of Mcconnellite

Relationship of Mcconnellite to other Species

Other Members of Group:
Structurally related to group(s):
4.AB.Carbon Monoxide IceCO
4.AB.05CredneriteCuMnO2
4.AB.10TenoriteCuO
4.AB.15DelafossiteCu1+Fe3+O2
4.AB.20BromelliteBeO
4.AB.20ZinciteZnO
4.AB.25BunseniteNiO
4.AB.25LimeCaO
4.AB.25ManganositeMn2+O
4.AB.25MonteponiteCdO
4.AB.25PericlaseMgO
4.AB.25WüstiteFeO
4.AB.30Palladinite(Pd,Cu)O
7.14.1EskolaiteCr2O3
7.14.2BracewelliteCrO(OH)
7.14.3GrimaldiiteCrO(OH)
7.14.4GuyanaiteCrO(OH)
7.14.5YimengiteK(Cr,Ti,Fe,Mg)12O19
7.14.6Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
7.14.8RedledgeiteBa(Ti64+Cr23+)O16
7.14.9HawthorneiteBaMgTi3Cr4Fe22+Fe23+O19
7.14.10ZincochromiteZnCr2O4
7.14.11WattersiteHg41+Hg2+O2(CrO4)
7.14.12ChromiteFe2+Cr2O4
7.14.13MagnesiochromiteMgCr23+O4

Other Names for Mcconnellite

Name in Other Languages:

Other Information

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 Mcconnellite

Reference List:
Milton, C., D.E. Appleman, M.H. Appleman, E.C.T. Chao, F. Cuttitta, J.I.
Dinnin, E.J. Dwornik, B.L. Ingram, and H.J. Rose, Jr. (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.

American Mineralogist (1977): 62: 593 (abstract).

Dannhauser, W. and P.A. Vaughan (1955) The crystal structure of cuprous chromite. Journal of the American Chemical Society: 77: 896-897.

Internet Links for Mcconnellite

mindat.org URL:
https://www.mindat.org/min-2612.html
Please feel free to link to this page.

Localities for Mcconnellite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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