Cornetite Mineral Data

Cornetite Mineral Data
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General Cornetite Information

Help on Chemical Formula: Chemical Formula: Cu3(PO4)(OH)3
Help on Composition: Composition: Molecular Weight = 336.63 gm
   Copper      56.63 %  Cu   70.89 % CuO
   Phosphorus   9.20 %  P    21.08 % P2O5
   Hydrogen     0.90 %  H     8.03 % H2O
   Oxygen      33.27 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu3(PO4)(OH)3
Help on Environment: Environment: Secondary mineral in the oxidized zone of some hydrothermal copper deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1917
Help on Locality: Locality: Star of the Congo mine, near Lubumbashi, and at the Kalabi and Lukini mines, Katanga Province, Congo (Shaba Province, Zaire). Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Jules Cornet (1865-1929), Belgian geologist.
Help on Name Pronunciation: Name Pronunciation: Cornetite + Pronunciation Say CORNETITE
Help on Synonym: Synonym: ICSD 67044
  PDF 37-449
 

Cornetite Image

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Cornetite

Comments: Crystals of cornetite on matrix.
Location: Etoile Mine, Katanga Province, Dem. Rep. of Congo. Scale: Crystal size 0.5 cm.
© John Veevaert
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Cornetite

Comments: Radial groups of intense blue cornetite crystals in green malachite.
Location: Mine de l'Etoile, Shaba, Lubumbashi Zaire. Scale: Picture size 5 cm.
© Fabre Minerals

Cornetite Crystallography
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.04(1), 4.29(0.9), 3.17(0.8),
Help on Forms: Forms:

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Forms: ( 2 1 0) ( 0 2 1)

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Click Here for Large Cornetite Structure Window Crystal Structure:

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Eby R K , Hawthorne F C , Mineralogy and Petrology , 40 (1989) p.127-136, Cornetite: modulated densely-packed Cu2+ oxysalt, Locality: Mine de L Etoile, Katanga, Zaire

 

Physical Properties of Cornetite

Help on Color: Color: Greenish blue, Dark blue.
 

Optical Properties of Cornetite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1947,KPDmeas= 0.1947,KC= 0.1864
Ncalc = 1.76
 

Calculated Properties of Cornetite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.92 gm/cc
note: Specific Gravity of Cornetite =4.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001610413
Boson Index = 0.9998389587
Help on Photoelectric: Photoelectric: PECornetite = 25.40 barns/electron
U=PECornetite x rElectron Density= 99.62 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cornetite is Not Radioactive
 

Cornetite Classification
Help on Dana Class: Dana Class: 41.03.02.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.03)where (A B)3 (XO4) Zq
  (41.03.02)Dana Group
 
41.03.02.01 Cornetite Cu3(PO4)(OH)3 P bca 2/m 2/m 2/m
 
41.03.02.02 Theoparacelsite! Cu3(OH)2(As2O7) Pmma 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 08.BE.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1
 
08.BE.15 Cornetite Cu3(PO4)(OH)3 P bca 2/m 2/m 2/m
 

Other Cornetite Information
Help on See Also: See Also: Links to other databases for Cornetite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Glendale Community College
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Ask about Cornetite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Cornetite Specimen Label here :

Cornetite

Cu3(PO4)(OH)3
Dana No: 41.03.02.01 Strunz No: 08.BE.15
Locality:

 

Notes: