IMPORTANT MESSAGE. We need your support now to keep mindat.org running. Click here to find out why.
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for Educators
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Mcconnellite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About McconnelliteHide

Richard B. McConnell
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.


Classification of McconnelliteHide

Approved
First Published:
1976
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

Associated Minerals at Type Locality:
Reference:
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.

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)
Dannhauser, W., Vaughan, P.A. (1955) The crystal structure of cuprous chromite. Journal of the American Chemical Society: 77: 896-897.
Geological Society of America, Program for Annual Meeting (1967) p. 151.
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.
Fleischer, M., Cabri, L.J., Nickel, E.H., Pabst, A. (1977) New mineral names. American Mineralogist: 62: 593-600.

Internet Links for McconnelliteHide

Localities for McconnelliteHide

ⓘ - 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
 
  • Oshikoto Region (Otjikoto Region)
    • 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  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 21, 2018 22:57:43 Page generated: October 21, 2018 08:06:08
Go to top of page