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Cornubite

Big Photo

Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France
© JY. Desescaut

Show Cornubite Photos (48)
Formula:
Cu
 
5
[(OH)
 
2
|AsO
 
4
]
 
2
System:TriclinicColour:Apple green, Light to ...
Lustre:VitreousHardness:4
Name:Named for Cornubia, the medieval Latin name for Cornwall.
Dimorph of:Cornwallite


The triclinic dimorph of Cornwallite.

Classification of Cornubite

IMA status:Approved
Strunz 8th edition ID:7/B.11-50
Nickel-Strunz 10th (pending) edition ID:8.BD.30

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1
Dana 8th edition ID:41.4.2.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq
Hey's CIM Ref.:20.1.5

20 : Arsenates (also arsenates with phosphate, but without other anions)
1 : Arsenates of Cu
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Type Occurrence of Cornubite

Type Locality:Wheal Carpenter, Fraddam, Gwinear, St Erth - Gwithian Area, Cornwall, England, UK
Place of Conservation of Type Material:Natural History Museum, London 1964R, 8650
Year of Discovery:1958

Occurrences of Cornubite

Geological Setting:Oxidation zone of copper deposits

Physical Properties of Cornubite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Apple green, Light to dark green
Streak:Pale green
Hardness (Mohs):4
Cleavage:Distinct/Good
Two perpendicular to {211}, intersecting about 70 degrees.
Density (measured):4.64 g/cm3
Density (calculated):4.85 g/cm3
Comment:Density on fibrous material.

Crystallography of Cornubite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 6.121(1) Å, b = 6.251(1) Å, c = 6.79Å
α = 92.93(1)°, β = 111.3°, γ = 107.47(1)°
Ratio:a:b:c = 0.979 : 1 : 1.086
Unit Cell Volume:V 227.11 ų (Calculated from Unit Cell)
Z:1
Morphology:Crystals in tabular aggregates, fibrous, botyroidal, globular porcelaneous masses.

Optical Data of Cornubite

Type:Biaxial (-)
RI values: nα = 1.870 nγ = 1.900
Maximum Birefringence:δ = 0.030

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v
Comments:2V very large, beta N.D.

Chemical Properties of Cornubite

Formula:
Cu
 
5
[(OH)
 
2
|AsO
 
4
]
 
2
Essential elements:As, Cu, H, O
All elements listed in formula:As, Cu, H, O

Relationship of Cornubite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BD.05Cornwallite
Cu
 
5
[(OH)
 
2
|AsO
 
4
]
 
2
8.BD.05Pseudomalachite
Cu
 
5
[(OH)
 
2
|PO
 
4
]
 
2
8.BD.05Reichenbachite
Cu
 
5
[(OH)
 
2
|PO
 
4
]
 
2
8.BD.10Arsenoclasite
Mn
2+
5
[(OH)
 
2
|AsO
 
4
]
 
2
8.BD.10Gatehouseite
Mn
2+
5
[(OH)
 
2
|PO
 
4
]
 
2
8.BD.15Parwelite
Mn
 
10
Sb
 
2
As
 
2
Si
 
2
O
 
24
8.BD.20Reppiaite
Mn
2+
5
[(OH)
 
2
|VO
 
4
]
 
2
8.BD.25Ludjibaite
Cu
 
5
[(OH)
 
2
|PO
 
4
]
 
2
Related Minerals - Hey's Index Grouping:

- +
20.1.1Lammerite
Cu
 
3
[AsO
 
4
]
 
2
20.1.2Olivenite
Cu
 
2
[OH|AsO
 
4
]
20.1.3Clinoclase
Cu
 
3
[(OH)
 
3
|AsO
 
4
]
20.1.4Cornwallite
Cu
 
5
[(OH)
 
2
|AsO
 
4
]
 
2
20.1.6Chlorotile (of Frenzel)
20.1.7Geminite
Cu
 
2
[As
 
2
O
 
7
] · 3H
 
2
O
20.1.8Euchroite
Cu
 
2
[OH|AsO
 
4
] · 3H
 
2
O
20.1.9Strashimirite
Cu
 
8
[OH|AsO
 
4
]
 
4
 · 5H
 
2
O
20.1.10Arhbarite
Cu
 
2
Mg[(OH)
 
3
|AsO
 
4
]
20.1.11Lindackerite
CuCu
 
4
[HAsO
 
4
|AsO
 
4
]
 
2
 · 8-9H
 
2
O
20.1.12Conichalcite
CaCu[OH|AsO
 
4
]
20.1.13Liroconite
Cu
 
2
Al[(OH)
 
4
|AsO
 
4
] · 4H
 
2
O
20.1.14Ceruleite
Cu
 
2
Al
 
7
[(OH)
 
13
|(AsO
 
4
)
 
4
] · 11.5H
 
2
O
20.1.15Chenevixite
Cu
 
2
Fe
3+
2
[(OH)
 
2
|AsO
 
4
]
 
2
20.1.16Arthurite
CuFe
3+
2
[(OH,O)|(AsO
 
4
,PO
 
4
,SO
 
4
)]
 
2
 · 4H
 
2
O

Other Names for Cornubite

Synonyms:
CorunuviteCorvunvite
Other Languages:
German:Cornubit
Corunuvit
Corvunvit
Russian:Корнубит
Spanish:Cornubita
Corunuvita
Corvunvita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Cornubite

Reference List:American Mineralogist: 44: 1321.

American Mineralogist: 70: 1333.

Bulletin of the Geological Society of Finland: 57: 119-127.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680pp.: 128.

Internet Links for Cornubite

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  • Raman and XRD data at RRUFF project
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  • Cornubite details from Handbook of Mineralogy (PDF)
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    Localities for Cornubite

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