Cornetite Mineral Data

General Cornetite Information

Chemical Formula:

Cu3(PO4)(OH)3

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

Empirical Formula:

Cu₃(PO₄)(OH)₃

Environment:

Secondary mineral in the oxidized zone of some hydrothermal copper deposits.

IMA Status:

Valid Species (Pre-IMA) 1917

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.

Name Origin:

Named for Jules Cornet (1865-1929), Belgian geologist.

Name Pronunciation:

Cornetite + Pronunciation

Synonym:

ICSD 67044

PDF 37-449

Cornetite Image

Images:

Cornetite

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

Images:

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/I_o): 3.04(1), 4.29(0.9), 3.17(0.8),

Forms:

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

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Physical Properties of Cornetite

Color:

Greenish blue, Dark blue.

Optical Properties of Cornetite

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

Electron Density:

Bulk Density (Electron Density)=3.92 gm/cc
note: Specific Gravity of Cornetite =4.10 gm/cc.

Fermion Index:

Fermion Index = 0.0001610413
Boson Index = 0.9998389587

Photoelectric:

PE_Cornetite= 25.40 barns/electron
U=PE_Cornetite x rElectron Density= 99.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cornetite is Not Radioactive

Cornetite Classification

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

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

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 - GeoScienceWorld
7 - Glendale Community College
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

Search for Cornetite using:

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Ask about Cornetite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

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:

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