Mineralogy Database

Cornubite Mineral Data

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General Cornubite Information

Help on Chemical  Formula: Chemical Formula: Cu5(AsO4)2(OH)4
Help on Composition: Composition: Molecular Weight = 681.61 gm
   Copper    46.61 %  Cu   58.35 % CuO
   Arsenic   21.98 %  As   33.72 % As2O5
   Hydrogen   0.89 %  H     7.93 % H2O
   Oxygen    30.51 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu5(AsO4)2(OH)4•(H2O)
Help on Environment: Environment: Rare secondary mineral in oxidized copper deposits. Dimorphous with cornwallite.
Help on IMA Status: IMA Status: Approved IMA 1959
Help on Locality: Locality: Wheal Carpenter, Cornwall, England. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from Cornubia, the Latin name for Cornwall, source of the first specimens.
Help on Synonym: Synonym: ICSD 30683
  PDF 41-1460

Cornubite Image

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  Cornubite   Conichalcite

Comments: Blue green crystalline cornubite alteration of enargite with green conichalcite in white calcite.
Location: Lime Bluff Quarry, Lycoming County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cornubite Crystallography

Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.489(1), 2.562(1), 4.72(1),

Physical Properties of Cornubite

Help on Color: Color: Green, Apple green, Dark green.

Optical Properties of Cornubite

Help on Optical Data: Optical Data: NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.1808) where Ncalc=Dcalc*KC+1
NCalc= 1.84 - from Gladstone-Dale relationship (KC = 0.1808) where Ncalc=Dmeas*KC+1

Calculated Properties of Cornubite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.69 gm/cc
note: Specific Gravity of Cornubite =4.98 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001478015
Boson Index = 0.9998521985
Help on Photoelectric: Photoelectric: PECornubite = 35.97 barns/electron
U=PECornubite x rElectron Density= 168.71 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cornubite is Not Radioactive

Cornubite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.04)where (A B)5 (XO4)2 Zq
  (41.04.02)Dana Group Cornubite Cu5(AsO4)2(OH)4 P1 1 Cornwallite Cu5(AsO4)2(OH)4 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 08.BD.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BD -With only medium-sized cations, (OH, etc.):RO4 = 2:1
08.BD.30 Cornubite Cu5(AsO4)2(OH)4 P1 1

Other Cornubite Information

Help on See Also: See Also: Links to other databases for Cornubite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
16 - theimage

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Dana No: Strunz No: 08.BD.30