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Cornetite

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Jules Cornet
Formula:
Cu3(PO4)(OH)3
Colour:
Dark blue to green-blue; green-blue in transmitted light.
Lustre:
Vitreous
Hardness:
Specific Gravity:
4.1
Crystal System:
Orthorhombic
Name:
Named in honor of Mr. Jules Cornet (La Louvière, Belgium, March 4, 1865 - Mons, Belgium, May 17, 1929), Belgian geologist. He prospected in the Congo and particularly in Katanga where he discovered its immense mineral wealth.
This page provides mineralogical data about Cornetite.


Hide all sections | Show all sections

Classification of CornetiteHide

Approved, 'Grandfathered' (first described prior to 1959)
8.BE.15

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1
41.3.2.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
19.2.2

19 : Phosphates
2 : Phosphates of Cu

Pronounciation of CornetiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of CornetiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Dark blue to green-blue; green-blue in transmitted light.
Comment:
May exhibit colour zoning in shades of green-blue.
Hardness:
4½ on Mohs scale
Cleavage:
None Observed
Density:
4.1 g/cm3 (Measured)    4.1 g/cm3 (Calculated)

Optical Data of CornetiteHide

Type:
Biaxial (-)
RI values:
nα = 1.765 nβ = 1.810 nγ = 1.820
2V:
Measured: 33° , Calculated: 48°
Max Birefringence:
δ = 0.055
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
none
Pleochroism:
Non-pleochroic

Chemical Properties of CornetiteHide

Formula:
Cu3(PO4)(OH)3
IMA Formula:
Cu3PO4(OH)3
Common Impurities:
Co

Crystallography of CornetiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Cell Parameters:
a = 10.88 Å, b = 14.1 Å, c = 7.11 Å
Ratio:
a:b:c = 0.772 : 1 : 0.504
Unit Cell V:
1,090.73 ų (Calculated from Unit Cell)
Morphology:
Crystals short prismatic [001] to equant. Face {210} commonly rounded. Crusts of minute crystals.
Twinning:
Reported on {h0l}.

Type Occurrence of CornetiteHide

Other Language Names for CornetiteHide

German:Cornetit
Spanish:Cornetita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Malachite57 photos of Cornetite associated with Malachite on mindat.org.
Chrysocolla42 photos of Cornetite associated with Chrysocolla on mindat.org.
Pseudomalachite15 photos of Cornetite associated with Pseudomalachite on mindat.org.
Heterogenite15 photos of Cornetite associated with Heterogenite on mindat.org.
Libethenite12 photos of Cornetite associated with Libethenite on mindat.org.
Chalcocite2 photos of Cornetite associated with Chalcocite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BE.05AugeliteAl2(PO4)(OH)3Mon. 2/m : B2/m
8.BE.10GrattarolaiteFe3+3(PO4)O3Trig. 3m : R3m
8.BE.20ClinoclaseCu3(AsO4)(OH)3Mon. 2/m : P21/b
8.BE.25ArhbariteCu2Mg(AsO4)(OH)3Tric. 1 : P1
8.BE.25GilmariteCu3(AsO4)(OH)3Tric.
8.BE.30AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
8.BE.30FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth.
8.BE.30RaadeiteMg7(PO4)2(OH)8Mon. 2/m
8.BE.30ArganditeMn7(VO4)2(OH)8Mon. 2/m : P21/m
8.BE.35Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
8.BE.35Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
8.BE.40Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5Tric.
8.BE.45DixeniteCuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6Trig.
8.BE.45Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
8.BE.45KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16Orth. 2 2 2 : C2 2 21
8.BE.45McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21Trig. 3m (3 2/m)
8.BE.45Arakiite(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23Mon.
8.BE.45Turtmannite(Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+xTrig.
8.BE.45CarlfrancisiteMn2+3(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42 Trig. 3m (3 2/m) : R3c
8.BE.50SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.BE.55Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8Orth. mmm (2/m 2/m 2/m) : Ccca
8.BE.60KoliciteMn2+7Zn4(AsO4)2(SiO4)2(OH)8Orth. mmm (2/m 2/m 2/m) : Cmca
8.BE.65Sabelliite(Cu,Zn)2Zn(AsO4,SbO4)(OH)3Trig. 3 : P3
8.BE.70JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2
8.BE.75TheisiteCu5Zn5(AsO4,SbO4)2(OH)14Orth.
8.BE.80CoparsiteCu4(AsO4,VO4)O2ClOrth.
8.BE.85WaterhouseiteMn2+7(PO4)2(OH)8Mon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.2.1LibetheniteCu2(PO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnnm
19.2.3ReichenbachiteCu5(PO4)2(OH)4Mon. 2/m
19.2.4LudjibaiteCu5(PO4)2(OH)4Tric. 1 : P1
19.2.5PseudomalachiteCu5(PO4)2(OH)4Mon. 2/m : P21/b
19.2.6NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon.
19.2.7ZapataliteCu3Al4(PO4)3(OH)9 · 4H2OTet.
19.2.8TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2OTric. 1 : P1
19.2.9SieleckiiteCu3Al4(PO4)2(OH)12 · 2H2OTric.
19.2.10PlaneriteAl6(PO4)2(HPO4)2(OH)8 · 4 H2OTric. 1 : P1
19.2.11HentscheliteCuFe3+2(PO4)2(OH)2Mon.
19.2.13ChalcosideriteCuFe3+6(PO4)4(OH)8 · 4H2OTric. 1 : P1
19.2.14Phosphofibrite(H2O,K)3.5Fe8(PO4)6(OH)7 · 5H2OMon. 2/m

Other InformationHide

Notes:
Soluble in cold HCl.
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 CornetiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cesàro (1912) Société géologique de Belgique, Liége, Annales: 39: 241.
Hutchinson and MacGregor (1913) Nature: 92: 364.
Buttgenbach (1917): 452.
American Mineralogist (1920): 5: 17.
Hutchinson and MacGregor (1921) Mineralogical Magazine: 19: 225.
Ungemach (1929) Société géologique de Belgique, Liége, Annales: 52: 75.
Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 201.
Berry, L.G. (1946) American Mineralogist: 31: 190.
Berry, L.G. (1950) On pseudomalachite and cornetite. American Mineralogist: 35, 365-385.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 789-791.
Mineralogy and Petrology: 40: 127-136.

Internet Links for CornetiteHide

Localities for CornetiteHide

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.
Australia
 
  • Queensland
    • Cloncurry Shire
      • Cloncurry
Munro-Smith, V., Leverett, P., Sciberras, M. J., Sharpe, J. L., Williams, P. A. and Melchiorre, E. B. (2015): Copper and cobalt mineralization from the Desolation prospect, Mount Isa Block, Queensland. Australian Journal of Mineralogy 17, 83-87.; Vera Munro-Smith (2006) Cobalt Mineralisation in Selected Australian Deposits. PhD thesis, University of Western Sydney.
Crane, M.J., Sharpe, J.L., and Williams, P.A. (2001): Records of the Australian Museum 53, 49-56.
      • Rosebud Station
Museum Victoria Mineralogy Collection
      • Selwyn District
[UKJMM 19:24]
  • Western Australia
    • Roebourne Shire
      • Roebourne
Kim Macdonald
Chile
 
  • Atacama Region
    • Chañaral Province
      • El Salado
        • Mantoverde district
C. Lemanski collection (7198 & 7201CL).
    • Copiapó Province
      • Cachiyuyo de Llampos district
        • Carrera Pinto
maurizio dini collection - analysed material
  • Coquimbo Region
    • Choapa Province
      • Combarbalá
        • La Isla de Cogotí
samples analysed by Dr. Hubert Putz, Geological Department of Salzburg University, may 2009
    • Elqui Province
      • Brillador district
C. Ruiz Fuller/F. Peebles (1988): "Yacimientos metalíferos de Chile": Fondecyt, Stgo de Chile.
Democratic Republic of Congo (Zaïre)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Kambove District
L. Kruszewski collection
      • Kolwezi District
        • Kolwezi
      • Likasi (Jadotville; Jadotstad)
      • Luambo
Museum of Victoria specimen No. M 34022
      • Lubumbashi (Elizabethville)
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 176 & 790.
Lapis 17(3), 13-40 (1992)
      • Swambo
Lapis 17(3), 13-40 (1992)
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Schauinsland Pb-Zn mining district
        • Hofsgrund (South field)
S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
Morocco
 
  • Drâa-Tafilalet Region
    • Ouarzazate Province
      • Djebel Saghro (Jbel Saghro)
        • Bou Skour District
Georges FAVREAU collection
Portugal
 
  • Évora District
    • Vila Viçosa
      • Conceição
Journal of the Russel Society, volume 2, part 1, 1988 (p. 13-18)
South Africa
 
  • Northern Cape Province
    • Namakwa District (Namaqualand)
      • Okiep Copper District
        • Springbok
Windisch, W. (2014) An introduction to micromounting.; Thomas Kleser collection.; Leon Hupperichs collection.
Spain
 
  • Andalusia
    • Huelva
      • Minas de Riotinto
Bocamina, (4), (1999) 50-86.
USA
 
  • Arizona
    • Pima Co.
      • Tucson Mts
        • Amole District
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 121, 146, 187, 277; Khin, B.S. (1970), Cornetite from SAginaw Hill, AZ, Min.Rec.: 1: 117-118.
            • Amole Mine group
Mineralogy of Arizona, Third Edition, 1995
  • Colorado
    • Montrose Co.
      • La Sal District (Paradox Valley District)
Minerals of Colorado (1997) Eckels, E. B.
  • Nevada
    • Lyon Co.
      • Singatse Range
        • Yerington District
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 790; Nevada Bureau of Mines and Geology Special Publication 31, Minerals of Nevada.
NBMG Spec. Pub. 31 Minerals of Nevada p 105
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 790.
      • Yerington District
        • Artesia Lake
NBMG Spec. Pub. 31 Minerals of Nevada
    • Pershing Co.
      • Antelope District
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 861; Nevada Bureau of Mines and Geology Special Publication 31: Minerals of Nevada.
    • Washoe Co.
      • Peavine District
        • Copperfield
NBMG Bull 70 Geology and Mineral Resources of Washoe and Storey Counties, Nevada
  • New Mexico
    • Grant Co.
      • Burro Mountains District
        • Tyrone Area
Northrop, Minerals of New Mexico, 3rd rev. ed., 1996
Zambia
 
  • Copperbelt Province
    • Ndola District
      • Ndola
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 790.
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