Chalcomenite Mineral Data

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)

IMA Status:

Valid Species (Pre-IMA) 1881

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 64672

PDF 17-523

Chalcomenite Image

Images:

Chalcomenite

Comments: Blue crystals of chalcomenite on matrix.
Location: El Drag?n mine, Quijarro province, Potos?, 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

Diaphaniety:

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

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:

r_electron=3.14 gm/cc
note: r_Chalcomenite=3.32 gm/cc.

Fermion Index

Fermion Index = 0.02666
Boson Index = 0.97334

Photoelectric:

PE_Chalcomenite= 38.53 barns/electron
U=PE_Chalcomenite x r_electron= 120.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chalcomenite is Not Radioactive

Chalcomenite Classification

Dana Class:

34.2.2.1 (34)Selenites - Tellurites - Sulfites

(34.2)as A++ XO3 · x(H2O)

(34.2.2)Dana Group

34.2.2.1 Chalcomenite CuSeO3·2(H2O) P 2₁2₁2₁ 2 2 2

34.2.2.2 Teineite CuTeO3·2(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

IV/K.06-10 IV - Oxides

IV/K - Sulfides, selenides, tellurides with [XO3]2- groups and related structures

IV/K.06 - Chalcomenite - Cesbronite series

IV/K.06-10 Chalcomenite CuSeO3·2(H2O) P 2₁2₁2₁ 2 2 2

IV/K.06-20 Teineite CuTeO3·2(H2O) P 2₁2₁2₁ 2 2 2

IV/K.06-30 Cesbronite Cu5(TeO3)2(OH)6·2(H2O) P bcn 2/m 2/m 2/m

IV/K.06-30* Cesbronite-x Cu5(TeO3)2(OH)6·2(H2O) P bcn 2/m 2/m 2/m

Other Chalcomenite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Chalcomenite

CuSeO3·2(H2O)
Dana No: 34.2.2.1 Strunz No: IV/K.06-10
Locality:

Notes: