Mineralogy Database

Cobaltomenite Mineral Data

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General Cobaltomenite Information

Help on Chemical  Formula: Chemical Formula: CoSeO3•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: CoSeO3•2(H2O)
Help on Environment: Environment: Secondary mineral in the oxidation zone of hydrothermal selenium-sulfide bearing vein deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1882
Help on Locality: Locality: Cerro de Cacheuta, Mendoza Province, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the content of cobalt and the Greek for moon.

Cobaltomenite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.8657:1:0.7383
Help on Cell Dimensions: Cell Dimensions: a = 7.64, b = 8.825, c = 6.516, Z = 4; beta = 98.6° V = 434.39 Den(Calc)= 3.39
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.015(1), 5.72(0.95), 3.8(0.72),

Physical Properties of Cobaltomenite

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark red, Pink.
Help on Density: Density: 3.39
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: dark pink

Optical Properties of Cobaltomenite

Help on Gladstone-Dale: 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
Ncalc = 1.93
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Cobaltomenite =3.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PECobaltomenite = 35.71 barns/electron
U=PECobaltomenite x rElectron Density= 114.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cobaltomenite is Not Radioactive

Cobaltomenite Classification

Help on  Dana Class: Dana Class: (34)Selenites - Tellurites - Sulfites
  (34.02)as A++ XO3 � x(H2O)
  (34.02.03)Chalcomenite Group (Monoclinic) Clinochalcomenite CuSeO3•2(H2O) P 21/n 2/m Cobaltomenite CoSeO3•2(H2O) P 21/n 2/m Ahlfeldite (Ni,Co)SeO3•2(H2O) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 04.JH.10 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.10 Ahlfeldite (Ni,Co)SeO3•2(H2O) P 21/m 2/m
04.JH.10 Clinochalcomenite CuSeO3•2(H2O) P 21/n 2/m
04.JH.10 Cobaltomenite CoSeO3•2(H2O) P 21/n 2/m

Other Cobaltomenite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Cobaltomenite :
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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Dana No: Strunz No: 04.JH.10





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