Chalcomenite Mineral Data

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General Chalcomenite Information

Chemical Formula:

CuSeO3•2(H2O)

Composition:

Molecular Weight = 226.53 gm

Copper 28.05 % Cu 35.11 % CuO

Hydrogen 1.78 % H 15.91 % H₂O

Selenium 34.86 % Se 48.98 % SeO₂

Oxygen 35.31 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu(SeO₃)•2(H₂O)

Environment:

Secondary mineral in oxidized Cu-Se-bearing deposits.

IMA Status:

Valid Species (Pre-IMA) 1881

Locality:

Sierra de Cacheuta, in the Sierra de Umango and Sierra de Famatina, La Rioja Province, Argentina. Link to MinDat.org Location Data.

Name Origin:

From the Greek for copper and moon.

Name Pronunciation:

Chalcomenite + Pronunciation

Synonym:

ICSD 64672

PDF 17-523

Chalcomenite Image

Images:

Chalcomenite

Comments: Blue crystals of chalcomenite on matrix.
Location: El Dragón mine, Quijarro province, Potosí, Bolivia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Chalcomenite Crystallography

Axial Ratios:

a:b:c =0.7256:1:0.8032

Cell Dimensions:

a = 6.671, b = 9.193, c = 7.384, Z = 4; V = 452.83 Den(Calc)= 3.32

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 5.39(1), 4.94(0.9), 3.35(0.8),

Forms:

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Forms: ( 1 1 1) ( 1 2 0) ( 0 1 1) ( 1 1 0) ( 1 0 1)

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Crystal Structure:

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Robinson P D , Sen Gupta P K , Swihart G H , Houk L , American Mineralogist , 77 (1992) p.834-838, Crystal structure, H positions, and the Se lone pair of synthetic chalcomenite,, Cu(H2O)2[SeO3]

Physical Properties of Chalcomenite

Cleavage:

None

Color:

Light blue.

Density:

3.312

Diaphaneity:

Transparent

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Vitreous (Glassy)

Streak:

light blue

Optical Properties of Chalcomenite

Gladstone-Dale:

CI meas= -0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2185,KPDmeas= 0.219,KC= 0.2093
Ncalc = 1.69

Optical Data:

Biaxial (-), a=1.712, b=1.732, g=1.732, bire=0.0200, 2V(Calc)=0, 2V(Meas)=0.

Calculated Properties of Chalcomenite

Electron Density:

Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Chalcomenite =3.32 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Chalcomenite= 38.53 barns/electron
U=PE_Chalcomenite x rElectron Density= 120.85 barns/cc.

Radioactivity:

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

Chalcomenite Classification

Dana Class:

34.02.02.01 (34)Selenites - Tellurites - Sulfites

(34.02)as A++ XO3 · x(H2O)

(34.02.02)Chalcomenite Group (Orthorhombic)

34.02.02.01 Chalcomenite CuSeO3•2(H2O) P 2₁2₁2₁ 2 2 2

34.02.02.02 Teineite CuTeO3•2(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

04.JH.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JH -Selenites without additional anions, with H2O

04.JH.05 Chalcomenite CuSeO3•2(H2O) P 2₁2₁2₁ 2 2 2

Other Chalcomenite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Chalcomenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Chalcomenite Specimen Label here :

Chalcomenite

CuSeO3•2(H2O)
Dana No: 34.02.02.01 Strunz No: 04.JH.05
Locality:

Notes: