Cobaltomenite Mineral Data

Cobaltomenite Mineral Data

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General Cobaltomenite Information

Chemical Formula:

CoSeO3·2(H2O)

Composition:

Molecular Weight = 221.92 gm

Cobalt 26.56 % Co 37.37 % Co₂O₃

Hydrogen 1.82 % H 16.24 % H₂O

Selenium 35.58 % Se 50.00 % SeO₂

Oxygen 36.05 % O

______ ______

100.00 % 103.60 % = TOTAL OXIDE

Empirical Formula:

CoSeO₃·2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1882

Locality:

Link to MinDat.org Location Data.

Cobaltomenite Image

Images:

Cobaltomenite

Comments: Purple micro crystals of cobaltomenite on matrix.
Location: Paris #25 mine, Thompson district, Utah, USA. Scale: 2.5 x 2 cm.
© John Veevaert

Cobaltomenite Crystallography

Axial Ratios:

a:b:c =0.8657:1:0.7383

Cell Dimensions:

a = 7.64, b = 8.825, c = 6.516, Z = 4; beta = 98.6° V = 434.39 Den(Calc)= 3.39

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 3.015(1), 5.72(0.95), 3.8(0.72),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Wildner M , Neues Jahrbuch fur Mineralogie, Monatshefte , 1990 (1990) p.353-362, Crystal structure refinements of synthetic cobaltomenite (CoSeO3*2H2O), and ahlfeldite (NiSeO3*2H2O)

Physical Properties of Cobaltomenite

Cleavage:

None

Color:

Dark red, Pink.

Density:

3.39

Diaphaniety:

Transparent

Fracture:

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

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Vitreous (Glassy)

Streak:

dark pink

Optical Properties of Cobaltomenite

Gladstone-Dale:

CI meas= 0.223 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.223 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2142,KPDmeas= 0.2142,KC= 0.2756

Optical Data:

Biaxial (-), a=1.681, b=1.728, g=1.769, bire=0.0880, 2V(Calc)=82, 2V(Meas)=83.

Calculated Properties of Cobaltomenite

Electron Density:

r_electron=3.21 gm/cc
note: r_{Cobaltomenite}=3.39 gm/cc.

Fermion Index

Fermion Index = 0.02721
Boson Index = 0.97279

Photoelectric:

PE_{Cobaltomenite}= 35.71 barns/electron
U=PE_{Cobaltomenite} x r_electron= 114.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cobaltomenite is Not Radioactive

Cobaltomenite Classification

Dana Class:

34.2.3.2 (34)Selenites - Tellurites - Sulfites

(34.2)as A++ XO3 · x(H2O)

(34.2.3)Dana Group

34.2.3.1 Clinochalcomenite CuSeO3·2(H2O) P 2₁/n 2/m

34.2.3.2 Cobaltomenite CoSeO3·2(H2O) P 2₁/n 2/m

34.2.3.3 Ahlfeldite (Ni,Co)SeO3·2(H2O) P 2₁/m 2/m

Strunz Class:

IV/K.07-20 IV - Oxides

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

IV/K.07 - Clinochalcomenite - Ahlfeldite

IV/K.07-10 Clinochalcomenite CuSeO3·2(H2O) P 2₁/n 2/m

IV/K.07-20 Cobaltomenite CoSeO3·2(H2O) P 2₁/n 2/m

IV/K.07-30 Ahlfeldite (Ni,Co)SeO3·2(H2O) P 2₁/m 2/m

Other Cobaltomenite 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 Cobaltomenite :
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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Cobaltomenite

CoSeO3·2(H2O)
Dana No: 34.2.3.2 Strunz No: IV/K.07-20
Locality:

Notes: