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Cornetite

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Formula:
Cu3(PO4)(OH)3
System:
Orthorhombic
Colour:
Dark blue to green-blue; ...
Hardness:
Name:
After Mr. Jules Cornet (1865-1929), Belgian geologist.
This page provides mineralogical data about Cornetite.

Classification of Cornetite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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First Recorded Occurrence of Cornetite

Year of Discovery:
1916
Associated Minerals at First Recorded Locality:

Physical Properties of Cornetite

Vitreous
Diaphaneity (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 (Mohs):
Cleavage:
None Observed
Density:
4.1 g/cm3 (Measured)    4.1 g/cm3 (Calculated)

Crystallography of Cornetite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Cell Parameters:
a = 10.88Å, b = 14.1Å, c = 7.11Å
Ratio:
a:b:c = 0.772 : 1 : 0.504
Unit Cell Volume:
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}.

Optical Data of Cornetite

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 Cornetite

Formula:
Cu3(PO4)(OH)3
Essential elements:
All elements listed in formula:
Common Impurities:
Co

Relationship of Cornetite to other Species

8.BE.05AugeliteAl2(PO4)(OH)3
8.BE.10GrattarolaiteFe33+(PO4)O3
8.BE.20ClinoclaseCu3(AsO4)(OH)3
8.BE.25ArhbariteCu2Mg(AsO4)(OH)3
8.BE.25GilmariteCu3(AsO4)(OH)3
8.BE.30AllactiteMn72+(AsO4)2(OH)8
8.BE.30FlinkiteMn22+Mn3+(AsO4)(OH)4
8.BE.30RaadeiteMg7(PO4)2(OH)8
8.BE.30ArganditeMn7(VO4)2(OH)8
8.BE.35Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6
8.BE.35Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6
8.BE.40Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5
8.BE.45DixeniteCuMn142+Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6
8.BE.45Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23
8.BE.45KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16
8.BE.45McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21
8.BE.45Arakiite(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23
8.BE.45Turtmannite(Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+x
8.BE.45CarlfrancisiteMn32+(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42
8.BE.50SynadelphiteMn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
8.BE.55Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8
8.BE.60KoliciteMn72+Zn4(AsO4)2(SiO4)2(OH)8
8.BE.65Sabelliite(Cu,Zn)2Zn(AsO4,SbO4)(OH)3
8.BE.70JarosewichiteMn32+Mn3+(AsO4)(OH)6
8.BE.75TheisiteCu5Zn5(AsO4,SbO4)2(OH)14
8.BE.80CoparsiteCu4(AsO4,VO4)O2Cl
8.BE.85WaterhouseiteMn72+(PO4)2(OH)8
19.2.1LibetheniteCu2(PO4)(OH)
19.2.3ReichenbachiteCu5(PO4)2(OH)4
19.2.4LudjibaiteCu5(PO4)2(OH)4
19.2.5PseudomalachiteCu5(PO4)2(OH)4
19.2.6NissoniteCu2Mg2(PO4)2(OH)2 · 5H2O
19.2.7ZapataliteCu3Al4(PO4)3(OH)9 · 4H2O
19.2.8TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
19.2.9SieleckiiteCu3Al4(PO4)2(OH)12 · 2H2O
19.2.10PlaneriteAl6(PO4)2(HPO4)2(OH)8 · 4 H2O
19.2.11HentscheliteCuFe23+(PO4)2(OH)2
19.2.13ChalcosideriteCu(Fe3+,Al)6(PO4)4(OH)8 · 4H2O
19.2.14PhosphofibriteK<0.5(Fe3+,Cu)8(PO4)6(OH)7 · 7H2O

Other Names for Cornetite

Name in Other Languages:
German:Cornetit
Spanish:Cornetita

Other Information

Other Information:
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 Cornetite

Reference List:
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 Cornetite

Specimens:
The following Cornetite specimens are currently listed for sale on minfind.com.

Localities for Cornetite

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.
Australia
 
  • Queensland
    • Mount Isa - Cloncurry area
      • Cloncurry District
        • Cloncurry
Crane, M.J., Sharpe, J.L., and Williams, P.A. (2001): Records of the Australian Museum 53, 49-56.
      • 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
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
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 area
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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