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Cornubite Mineral Data
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General Cornubite Information
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Chemical Formula: |
Cu5(AsO4)2(OH)4 |
Composition: |
Molecular Weight = 681.61 gm |
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Copper 46.61 % Cu 58.35 % CuO |
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Arsenic 21.98 % As 33.72 % As2O5 |
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Hydrogen 0.89 % H 7.93 % H2O |
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Oxygen 30.51 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Cu5(AsO4)2(OH)4•(H2O) |
Environment: |
Rare secondary mineral in oxidized copper deposits. Dimorphous with cornwallite. |
IMA Status: |
Approved IMA 1959 |
Locality: |
Wheal Carpenter, Cornwall, England. Link to MinDat.org Location Data. |
Name Origin: |
Named from Cornubia, the Latin name for Cornwall, source of the first specimens. |
Synonym: |
ICSD 30683 |
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PDF 41-1460 |
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Cornubite Image |
Images:
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Cornubite Crystallography
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X Ray Diffraction: |
By Intensity(I/Io): 2.489(1), 2.562(1), 4.72(1), |
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Physical Properties of Cornubite
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Color: |
Green, Apple green, Dark green. |
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Optical Properties of Cornubite
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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
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Calculated Properties of Cornubite
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Electron Density: |
Bulk Density (Electron Density)=4.69 gm/cc note: Specific Gravity of Cornubite =4.98 gm/cc. |
Fermion Index: |
Fermion Index = 0.0001478015 Boson Index = 0.9998521985 |
Photoelectric: |
PECornubite = 35.97 barns/electron U=PECornubite x rElectron Density= 168.71 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cornubite is Not Radioactive |
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Cornubite Classification
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Dana Class: |
41.04.02.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen |
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(41.04)where (A B)5 (XO4)2 Zq |
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(41.04.02)Dana Group |
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41.04.02.01 Cornubite Cu5(AsO4)2(OH)4 P1 1 |
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41.04.02.02 Cornwallite Cu5(AsO4)2(OH)4 P 21/a 2/m |
Strunz Class: |
08.BD.30 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.B - Phosphates, etc. with Additional Anions, without H2O |
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08.BD -With only medium-sized cations, (OH, etc.):RO4 = 2:1 |
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08.BD.30 Cornubite Cu5(AsO4)2(OH)4 P1 1 |
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Other Cornubite Information
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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
15 - WWW-MINCRYST
16 - theimage
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Print or Cut-and-Paste your Cornubite Specimen Label here :
Cornubite
Cu5(AsO4)2(OH)4
Dana No: 41.04.02.01 Strunz No: 08.BD.30
Locality:
Notes:
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