Cornwallite Mineral Data

Cornwallite Mineral Data
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General Cornwallite 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: Dimorphous with cornubite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1847
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the English leader Cornwall.
Help on Name Pronunciation: Name Pronunciation: Cornwallite + Pronunciation Say CORNWALLITE
Help on Synonym: Synonym: Erinite
  ICSD 89035
  PDF 39-1357
 

Cornwallite Image

Click Here for Larger Cornwallite Image in a New Browser Window Images:
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Cornwallite

Comments: Emerald green botryoidal crystals of cornwallite.
Location: Tintic District, Juab County, Utah, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Cornwallite Crystallography
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.22(1), 3.1(0.9), 3.53(0.9),
Click Here for Large Cornwallite Structure Window Crystal Structure:

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Arlt T , Armbruster T , Neues Jahrbuch fur Mineralogie, Monatshefte , 1999 (1999) p.468-480, Single-crystal X-ray structure refinement of cornwallite, Cu5(AsO4)2(OH)4:, A comparison with its polymorph cornubite and the (PO4)-analogue pseudomalachite, Locality: Clara mine, Oberwolfach, Black Forest, Germany, Note: Biso for O2 and O4 switched to match calculated values

 

Physical Properties of Cornwallite

Help on Color: Color: Light green, Dark green, Black green.
 

Optical Properties of Cornwallite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.119 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1692,KPDmeas= 0.2024,KC= 0.1808
Ncalc = 1.72 - 1.88
 

Calculated Properties of Cornwallite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.60 gm/cc
note: Specific Gravity of Cornwallite =4.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001478015
Boson Index = 0.9998521985
Help on Photoelectric: Photoelectric: PECornwallite = 35.97 barns/electron
U=PECornwallite x rElectron Density= 165.32 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cornwallite is Not Radioactive
 

Cornwallite Classification
Help on Dana Class: Dana Class: 41.04.02.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.04)where (A B)5 (XO4)2 Zq
  (41.04.02)Dana Group
 
41.04.02.01 Cornubite Cu5(AsO4)2(OH)4 P1 1
 
41.04.02.02 Cornwallite Cu5(AsO4)2(OH)4 P 21/a 2/m
Help on Strunz Class: Strunz Class: 08.BD.05 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.05 Cornwallite Cu5(AsO4)2(OH)4 P 21/a 2/m
 
08.BD.05 Pseudomalachite Cu5(PO4)2(OH)4 P 21/a 2/m
 
08.BD.05 Reichenbachite Cu5(PO4)2(OH)4 P 21/a 2/m
 

Other Cornwallite Information
Help on See Also: See Also: Links to other databases for Cornwallite :
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

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Visit our Advertisers for Cornwallite :

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Ask about Cornwallite 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 Español

Print or Cut-and-Paste your Cornwallite Specimen Label here :

Cornwallite

Cu5(AsO4)2(OH)4
Dana No: 41.04.02.02 Strunz No: 08.BD.05
Locality:

 

Notes: