Cornwallite Mineral Data

General Cornwallite 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:

Dimorphous with cornubite.

IMA Status:

Valid Species (Pre-IMA) 1847

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the English leader Cornwall.

Name Pronunciation:

Cornwallite + Pronunciation

Synonym:

Erinite

ICSD 89035

PDF 39-1357

Cornwallite Image

Images:

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/I_o): 3.22(1), 3.1(0.9), 3.53(0.9),

Physical Properties of Cornwallite

Color:

Light green, Dark green, Black green.

Optical Properties of Cornwallite

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

Electron Density:

Bulk Density (Electron Density)=4.60 gm/cc
note: Specific Gravity of Cornwallite =4.88 gm/cc.

Fermion Index:

Fermion Index = 0.0001478015
Boson Index = 0.9998521985

Photoelectric:

PE_Cornwallite= 35.97 barns/electron
U=PE_Cornwallite x rElectron Density= 165.32 barns/cc.

Radioactivity:

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

Cornwallite Classification

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

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

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

Search for Cornwallite using:

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Ask about Cornwallite here :
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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: