Chenevixite Mineral Data

General Chenevixite Information

Chemical Formula:

Cu2Fe+++2(AsO4)2(OH)4•(H2O)

Composition:

Molecular Weight = 602.67 gm

Iron 18.53 % Fe 26.50 % Fe₂O₃

Copper 21.09 % Cu 26.40 % CuO

Arsenic 24.86 % As 38.14 % As₂O₅

Hydrogen 1.00 % H 8.97 % H₂O

Oxygen 34.51 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₂Fe³⁺₂(AsO₄)₂(OH)₄•(H₂O)

Environment:

Secondary mineral in the oxidized zone of some hydrothermal polymetallic mineral deposits. Forms a series with luetheite.

IMA Status:

Valid Species (Pre-IMA) 1866

Locality:

American Eagle mine, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Richard Chenevix (1774-1830), Irish chemist, who early analyzed a Cornish Cu-Fe arsenate.

Chenevixite Image

Images:

Chenevixite

Comments: Green micro crystals of chenevixite on matrix.
Location: Majuba Hill, Pershing County, Nevada, USA. Scale: Size Not Given.
© John Veevaert

Chenevixite Crystallography

Axial Ratios:

a:b:c =2.8918:1:1.1031

Cell Dimensions:

a = 15.006, b = 5.189, c = 5.724, Z = 2; beta = 102.25° V = 435.56 Den(Calc)= 4.59

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.56(1), 2.553(0.7), 3.82(0.5),

Physical Properties of Chenevixite

Cleavage:

None

Color:

Yellow green, Dark green, Olive green.

Density:

3.9

Diaphaneity:

Subtranslucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Compact - Occurs as a compact mass.

Habit:

Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Greasy (Oily)

Streak:

greenish yellow

Optical Properties of Chenevixite

Gladstone-Dale:

CI meas= -0.131 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2121,KPDmeas= 0.2496,KC= 0.2206
Ncalc = 1.86 - 2.01

Optical Data:

Biaxial (+), a=1.92, b=1.96, g=2.04, bire=0.1200

Calculated Properties of Chenevixite

Electron Density:

Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Chenevixite =4.59 gm/cc.

Fermion Index:

Fermion Index = 0.0040962054
Boson Index = 0.9959037946

Photoelectric:

PE_Chenevixite= 32.02 barns/electron
U=PE_Chenevixite x rElectron Density= 139.51 barns/cc.

Radioactivity:

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

Chenevixite Classification

Dana Class:

42.07.10.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq � x(H2O)

(42.07.10)Chenevixite Group

42.07.10.01 Chenevixite Cu2Fe2(AsO4)2(OH)4•(H2O) P 2₁/m 2/m

42.07.10.02 Luetheite Cu2Al2(AsO4)2(OH)4•(H2O) P 2₁/m 2/m

Strunz Class:

08.DD.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1

08.DD.05 Chenevixite Cu2Fe2(AsO4)2(OH)4•(H2O) P 2₁/m 2/m

08.DD.05 Luetheite Cu2Al2(AsO4)2(OH)4•(H2O) P 2₁/m 2/m

Other Chenevixite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Chenevixite :
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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Print or Cut-and-Paste your Chenevixite Specimen Label here :

Chenevixite

Cu2Fe+++2(AsO4)2(OH)4•(H2O)
Dana No: 42.07.10.01 Strunz No: 08.DD.05
Locality:

Notes:

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