Cornubite Mineral Data

General Cornubite Information

Chemical Formula:

Cu5(AsO4)2(OH)4

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

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

PDF 41-1460

Cornubite Image

Images:

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/I_o): 2.489(1), 2.562(1), 4.72(1),

Crystal Structure:

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Sieber N H W , Hofmeister W , Tillmanns E , Abraham K , Fortschritte der Mineralogie , 62 (1984) p.231-232, Neue mineraldaten fur kupferphosphate und -arsenate von Reichenbach/Odw, Locality: Reichenbach, Germany

Physical Properties of Cornubite

Color:

Green, Apple green, Dark green.

Optical Properties of Cornubite

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

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:

PE_Cornubite= 35.97 barns/electron
U=PE_Cornubite x rElectron Density= 168.71 barns/cc.

Radioactivity:

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

Cornubite Classification

Dana Class:

41.04.02.01 (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

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

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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Ask about Cornubite 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 Cornubite Specimen Label here :

Cornubite

Cu5(AsO4)2(OH)4
Dana No: 41.04.02.01 Strunz No: 08.BD.30
Locality:

Notes: