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Cornetite

A valid IMA mineral species - grandfathered
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About CornetiteHide

08826030017197673054158.jpg
Jules Cornet
Formula:
Cu3(PO4)(OH)3
Colour:
Dark blue to green-blue; green-blue in transmitted light.
Lustre:
Vitreous
Hardness:
Specific Gravity:
4.10
Crystal System:
Orthorhombic
Name:
Named in honor of Mr. Jules Cornet (La Louvière, Belgium, March 4, 1865 - Mons, Belgium, May 17, 1929), a Belgian geologist. He prospected in the Congo and particularly in Katanga where he discovered its immense mineral wealth.
Cornetite was the first new mineral discovered in Congo.
This page provides mineralogical data about Cornetite.


Unique IdentifiersHide

Mindat ID:
1131
Long-form identifier:
mindat:1:1:1131:6
GUID
(UUID V4):
534e7e3e-45b9-4456-af35-c4599c184437

IMA Classification of CornetiteHide

Approved, 'Grandfathered' (first described prior to 1959)

Classification of CornetiteHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CneIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Pronunciation of CornetiteHide

Pronunciation:
PlayRecorded byCountry
Jolyon 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:
4.10 g/cm3 (Measured)    4.14 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
Optical Extinction:
X = b; Y = a; Z = c.
Pleochroism:
Non-pleochroic

Chemistry of CornetiteHide

Mindat Formula:
Cu3(PO4)(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. May also show large {021}, {221}. Crusts of minute crystals.
Twinning:
Reported on {h0l}.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014624CornetiteEby R K, Hawthorne F C (1989) Cornetite: modulated densely-packed Cu2+ oxysalt Mineralogy and Petrology 40 127-1361989Mine de L'Etoile, Katanga, Zaire0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.07 Å(60)
5.48 Å(50)
4.55 Å(30)
4.29 Å(90)
3.68 Å(70)
3.17 Å(80)
3.04 Å(100)
2.95 Å(50)
2.74 Å(30)
2.54 Å(30)
2.44 Å(30)
2.15 Å(30)
2.06 Å(70)
1.574 Å(40)
1.545 Å(40)
1.509 Å(30)
Comments:
Bwana Mkubwa, Zambia. Data from Berry (1950).

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47c : [Carbonates, phosphates, borates, nitrates]

Type Occurrence of CornetiteHide

General Appearance of Type Material:
Blue crystals, either isolated or grouped, on sandstone. Square prisms with ocathedral terminations.
Place of Conservation of Type Material:
Laboratory of Mineralogy, University of Liège, Belgium, 9.130 and 9.133.
Geological Setting of Type Material:
Oxidized zone of a hydrothermal copper deposit.
Associated Minerals at Type Locality:

Other Language Names for CornetiteHide

German:Cornetit
Spanish:Cornetita

Common AssociatesHide

Associated Minerals Based on Photo Data:
124 photos of Cornetite associated with MalachiteCu2(CO3)(OH)2
87 photos of Cornetite associated with ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
44 photos of Cornetite associated with HeterogeniteCo3+O(OH)
34 photos of Cornetite associated with PseudomalachiteCu5(PO4)2(OH)4
22 photos of Cornetite associated with LibetheniteCu2(PO4)(OH)
2 photos of Cornetite associated with Duhamelite(Pb,Bi,Ca)Cu(VO4)(OH,O)
2 photos of Cornetite associated with Khorixasite(Bi0.670.33)Cu(VO4)(OH)
1 photo of Cornetite associated with MottramitePbCu(VO4)(OH)
1 photo of Cornetite associated with Sandstone

Related Minerals - Strunz-mindat 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. 1 : P1
8.BE.30AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
8.BE.30FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pnma
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.35Mineral E (of Dunn, et. al., 1982)Orth. mmm (2/m 2/m 2/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. 3 : R3
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. m : Bb
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. mmm (2/m 2/m 2/m) : Pbcm
8.BE.85WaterhouseiteMn2+7(PO4)2(OH)8Mon. 2/m : P21/b
8.BE.90VasilseverginiteCu9O4(AsO4)2(SO4)2Mon. 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.

Internet Links for CornetiteHide

References for CornetiteHide

Reference List:

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia
 
  • Queensland
    • City of Mount Isa
      • Rosebud Station
Museum Victoria Mineralogy Collection
    • Cloncurry Shire
      • Cloncurry
Vera Munro-Smith (2006) +1 other reference
Crane et al. (2001)
      • Rosebud Station
        • Mary Kathleen district
Sorrell (n.d.)
  • Western Australia
    • City of Karratha
      • Roebourne
Kim Macdonald
Chile
 
  • Atacama
    • Chañaral Province
      • Chañaral
        • El Salado
          • Mantoverde mining district
            • Mantoverde Project
C. Lemanski collection (7198 & 7201CL)
    • Copiapó Province
      • Copiapó
        • Cachiyuyo de Llampos mining district
          • Carrera Pinto
maurizio dini collection - analysed ...
  • Coquimbo
    • Elqui Province
      • Brillador mining district
C. Ruiz Fuller/F. Peebles (1988)
    • Limarí Province
      • Combarbalá
        • Cogotí
samples analysed by Dr. Hubert Putz
DR Congo
 
  • Haut-Katanga
    • Kambove Territory
      • Luambo
Museum of Victoria specimen No. M ... +1 other reference
    • Kipushi Territory
      • Kawama
Lapis 17 (3)
De Bondt (n.d.)
    • Likasi
    • Lubumbashi
Palache et al. (1951) +1 other reference
Mambwe et al. (Ruashi Cu-Co Deposit)
  • Lualaba
    • Lubudi
L. Kruszewski collection
    • Mutshatsha
Lapis 17 (3)
      • Kolwezi
Wilson (2018)
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Breisgau-Hochschwarzwald
        • Oberried
          • Hofsgrund
            • Hofsgrund (South field)
Weiß (1990)
Weiß (1990)
Morocco
 
  • Drâa-Tafilalet Region
    • Zagora Province
      • Agdz Cercle
        • Bou Skour mining district
Georges Favreau collection
Namibia
 
  • Kunene Region
    • Khorixas
      • Mesopotamia copper valley
SEM-EDS analysed by Georges Favreau (photo ID 1214009)
Russia
 
  • Zabaykalsky Krai
    • Kalarsky District
      • Kodar–Udokan ore district
        • Udokan
Gongalsky et al. (2019)
South Africa
 
  • Northern Cape
    • Namakwa District Municipality
      • Okiep Copper District
        • Springbok
Thomas Kleser Collection +2 other references
Spain
 
  • Andalusia
    • Huelva
      • Minas de Riotinto
Bocamina (4)
  • Castile and Leon
    • Salamanca
      • Golpejas
        • Golpejas Mining group
Calvo Rebollar et al. (2024)
  • Catalonia
    • Tarragona
      • Priorat
        • Cornudella de Montsant
Joan Abella i Creus (Joanabellacreus@gmail.com)
USA
 
  • Arizona
    • Pima County
      • Tucson Mountains
        • Amole Mining District
Khin (1970) +1 other reference
            • Amole Mine group
Mineralogy of Arizona
  • Colorado
    • Montrose County
      • La Sal Mining District (Paradox Valley Mining District)
Eckel et al. (1997)
  • Nevada
    • Lyon County
      • Singatse Range
        • Yerington Mining District
Palache et al. (1951) +1 other reference
          • Ludwig
Castor et al. (2004)
Castor et al. (2004)
Palache et al. (1951)
    • Pershing County
      • Antelope Mining District
Palache et al. (1951) +1 other reference
    • Washoe County
      • Peavine Mining District
        • Copperfield
NBMG Bull 70 Geology and Mineral ...
  • New Mexico
    • Grant County
      • Burro Mountains Mining District
        • Tyrone Area
Northrop et al. (1996)
Zambia
 
  • Copperbelt Province
    • Ndola District
Palache et al. (1951)
  • North-Western Province
    • Solwezi District
MacIntyre (2019)
 
and/or  
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