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Chenevixite

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Patagonia District, Patagonia Mts, Santa Cruz Co., Arizona, USA
© Brent Thorne

Show Chenevixite Photos (27)
Formula:
Cu
 
2
Fe
3+
2
[(OH)
 
2
|AsO
 
4
]
 
2
System:MonoclinicColour:Olive green, ...
Lustre:Hardness:3½ - 4½
Name:
Named after Richard Chenevix (1774-1830), French chemist, analyst of an arsenate of copper and iron from Cornwall in 1801 (later shown to be Chenevixite).


The Fe3+ analogue of Luetheite. Chenevixite-Luetheite Series.

A secondary mineral in oxidized zones of some hydrothermal, polymetallic ore deposits.

Classification of Chenevixite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/D.16-20
Nickel-Strunz 10th (pending) edition ID:8.DD.05

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1
Dana 8th edition ID:42.7.10.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
Hey's CIM Ref.:20.1.15

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

Type Locality:Wheal Gorland, St Day United Mines (Poldice Mines), Gwennap area, Camborne - Redruth - St Day District, Cornwall, England, UK
Year of Discovery:1866
Associated Minerals at type locality:
Quartz

Occurrences of Chenevixite

Geological Setting:Oxidized zones of hydrothermal polymetallic deposits.

Physical Properties of Chenevixite

Diaphaneity (Transparency):Transparent, Translucent
Colour:Olive green, yellow-green, dark green.
Streak:Greenish yellow
Hardness (Mohs):3½ - 4½
Tenacity:Brittle
Cleavage:None Observed
Fracture:Sub-Conchoidal
Comment:also earth fracture
Density (measured):4.38 g/cm3
Density (calculated):4.40 g/cm3

Crystallography of Chenevixite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Space Group Setting:P21/m
Cell Parameters:a = 5.7012Å, b = 5.1801Å, c = 29.265Å
β = 89.99°
Ratio:a:b:c = 1.101 : 1 : 5.65
Unit Cell Volume:V 864.3 ų
Z:4
Morphology:Crystals tabular {100} with diamond-shaped outlines; commonly microcrystalline, spheroidal, earthy to compact massive.
Twinning:Observed at a very fine scale.
Comment:Pseudo-orthorhombic.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Chenevixite

Type:Biaxial (+)
RI values: nα = 1.920 nβ = 1.960 nγ = 2.040
2V:Calculated: 73°
Maximum Birefringence:δ = 0.120

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:none
Pleochroism:Weak

Chemical Properties of Chenevixite

Formula:
Cu
 
2
Fe
3+
2
[(OH)
 
2
|AsO
 
4
]
 
2
Essential elements:As, Cu, Fe, H, O
All elements listed in formula:As, Cu, Fe, H, O

Relationship of Chenevixite to other Species

Series:Forms a series with Luetheite (see here)
Common Associates:
ScoroditeQuartzOlivenite
Related Minerals - Nickel-Strunz Grouping):

- +
8.DD.05Luetheite
Cu
 
2
Al
 
2
[(OH)
 
2
|AsO
 
4
]
 
2
8.DD.10Akrochordite
(Mn
2+
 
,Mg)
 
5
[(OH)
 
2
|AsO
 
4
]
 
2
 · 4H
 
2
O
8.DD.10Guanacoite
Cu
 
2
Mg
 
2
(Mg
 
0.5
Cu
 
0.5
)[(OH)
 
2
|AsO
 
4
]
 
2
 · 4H
 
2
O
8.DD.15Aheylite
(Fe
2+
 
,Zn)Al
 
6
[(OH)
 
4
|(PO
 
4
)
 
2
]
 
2
 · 4H
 
2
O
8.DD.15Chalcosiderite
Cu(Fe
3+
 
,Al)
 
6
[(OH)
 
4
|(PO
 
4
)
 
2
]
 
2
 · 4H
 
2
O
8.DD.15Faustite
(Zn,Cu)Al
 
6
[(OH)
 
4
|(PO
 
4
)
 
2
]
 
2
 · 4H
 
2
O
8.DD.15Planerite
Al
 
6
[(OH)
 
4
|HPO
 
4
|PO
 
4
]
 
2
 · 4 H
 
2
O
8.DD.15Turquoise
Cu(Al,Fe
3+
 
)
 
6
[(OH)
 
4
|(PO
 
4
)
 
2
]
 
2
 · 4H
 
2
O
8.DD.20Childrenite
(Fe
2+
 
,Mn
2+
 
)Al[(OH)
 
2
|PO
 
4
] · H
 
2
O
8.DD.20Eosphorite
(Mn
2+
 
,Fe
2+
 
)Al[(OH)
 
2
|PO
 
4
] · H
 
2
O
8.DD.20Ernstite
(Mn
2+
 
,Fe
3+
 
)Al[(OH,O)
 
2
|PO
 
4
] · H
 
2
O
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
20.1.5Cornubite
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
20.1.16Arthurite
CuFe
3+
2
[(OH,O)|(AsO
 
4
,PO
 
4
,SO
 
4
)]
 
2
 · 4H
 
2
O

Other Names for Chenevixite

Other Languages:
German:Chenevixit
Spanish:Chenevixita

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 Chenevixite

Reference List:Pisani (1866) Comptes rendu de l’Académie des sciences de Paris: 62: 690.

Dana, J.D. (1868) System of Mineralogy, 5th. Edition, New York: 583.

Genth (1884) Proceedings of the Colorado Science Society: 1: 115.

Mackenzie (1885) Mineralogical Magazine: 6: 181.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 56.

Smith (1926) New South Wales Department of Mines and Mineral Resources, no. 34: 80.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 840-841.

Villarroel, M. (1964): Contribution a l'étude de la chenevixite. Bull. Soc. fr. Minéral. Cristallogr. 87, 626-628.

Williams, S.A. (1977) Luetheite, Cu2Al2(AsO4)2(OH)4 •H2O, a new mineral from Arizona, compared with chenevixite. Mineralogical Magazine, 41, 27–32.

Burns, P. C., Smith, J. V. and Steele, I. M. (2000): Arizona porphyry copper/hydrothermal deposits I. The structure of chenevixite and luetheite. Mineralogical Magazine, 64, 25-30.

Internet Links for Chenevixite

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    Localities for Chenevixite

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