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Mcconnellite

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Merume river, Kamakusa, Mazaruni District, Guyana
© Brent Thorne

Formula:
CuCrO
 
2
System:TrigonalHardness:5½
Name:After Dr. Richard Bradford McConnell, former Director, British Guyana Geological Survey.


Delafossite Group.

Classification of Mcconnellite

IMA status:Approved
Strunz 8th edition ID:4/A.05-40
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:7.1.1.2

7 : MULTIPLE OXIDES
1 : ABX2
Hey's CIM Ref.:7.14.7

7 : Oxides and Hydroxides
14 : Oxides of Cr
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Type Occurrence of Mcconnellite

Type Locality:Merume river, Kamakusa, Mazaruni District, Guyana
Year of Discovery:1976

Physical Properties of Mcconnellite

Hardness (Mohs):5½

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)

Chemical Properties of Mcconnellite

Formula:
CuCrO
 
2
Essential elements:Cr, Cu, O
All elements listed in formula:Cr, Cu, O

Relationship of Mcconnellite to other Species

Member of Group:
Delafossite Group:
ABO
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
4.AB.05Crednerite
CuMnO
 
2
4.AB.10Tenorite
CuO
4.AB.15Delafossite
CuFeO
 
2
4.AB.20Bromellite
BeO
4.AB.20Zincite
(Zn,Mn
2+
 
,Fe
2+
 
)O
4.AB.25Bunsenite
NiO
4.AB.25Lime
CaO
4.AB.25Manganosite
MnO
4.AB.25Monteponite
CdO
4.AB.25Periclase
MgO
4.AB.25Wüstite
FeO
4.AB.30Palladinite
PdO
Related Minerals - Hey's Index Grouping:

- +
7.14.1Eskolaite
Cr
 
2
O
 
3
7.14.2Bracewellite
CrO(OH)
7.14.3Grimaldiite
CrO(OH)
7.14.4Guyanaite
CrO(OH)
7.14.5Yimengite
K(Cr,Ti,Fe,Mg)
 
12
O
 
19
7.14.6Mathiasite
K(Ti,Cr,Fe,Mg,Zr)
 
21
O
 
38
7.14.8Redledgeite
Ba
 
x
([Cr,Fe,V]
3+
2x
Ti
 
8-2x
)O
 
16
7.14.9Hawthorneite
BaMgTi
 
3
Cr
 
4
Fe
 
4
O
 
19
7.14.10Zincochromite
ZnCr
 
2
O
 
4
7.14.11Wattersite
(Hg-Hg)
2+
2
Hg
2+
 
[O
 
2
|CrO
 
4
]
7.14.12Chromite
FeCr
 
2
O
 
4
7.14.13Magnesiochromite
MgCr
 
2
O
 
4
7.14.14 Donathite

Other Names for Mcconnellite

Synonyms:
IMA1967-037
Other Languages:
German:McConnellit
Russian:Макконелит
Spanish:McConnellita

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Mcconnellite in the Natural History Museum (London) online catalogue
  • McConnellite details from Handbook of Mineralogy (PDF)
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    Localities for Mcconnellite

    (TL) indicates type locality. ? 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
     
    • Mazaruni District
      • Kamakusa
    		Geol.Soc.Amer.,Progr.Ann. Meeting (1967) p. 151; MINERALOGICAL MAGAZINE, DECEMBER 1984, VOL. 48, PP. 560 2
    Namibia
     
    • Otjikoto (Oshikoto) 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
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