Cobaltomenite Mineral Data

Advertisment

McDougall Minerals is based near famous Bancroft, Ontario, at the heart of one of the best mineral regions in Canada

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)

Environment:

Secondary mineral in the oxidation zone of hydrothermal selenium-sulfide bearing vein deposits.

IMA Status:

Valid Species (Pre-IMA) 1882

Locality:

Cerro de Cacheuta, Mendoza Province, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for the content of cobalt and the Greek for moon.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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
Ncalc = 1.93

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:

Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Cobaltomenite =3.39 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

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

Radioactivity:

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

Cobaltomenite Classification

Dana Class:

34.02.03.02 (34)Selenites - Tellurites - Sulfites

(34.02)as A++ XO3 · x(H2O)

(34.02.03)Chalcomenite Group (Monoclinic)

34.02.03.01 Clinochalcomenite CuSeO3•2(H2O) P 2₁/n 2/m

34.02.03.02 Cobaltomenite CoSeO3•2(H2O) P 2₁/n 2/m

34.02.03.03 Ahlfeldite (Ni,Co)SeO3•2(H2O) P 2₁/m 2/m

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

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 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
15 - WWW-MINCRYST

Search for Cobaltomenite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Cobaltomenite :

A Bijoux Google Search for Cobaltomenite
Adam's Minerals Google Search for Cobaltomenite
Cape Minerals Google Search for Cobaltomenite
Dakota Matrix Minerals Google Search for Cobaltomenite
Excalibur Mineral Corp. Google Search for Cobaltomenite
Exceptional Minerals Google Search for Cobaltomenite
John Betts Fine Minerals Search for Cobaltomenite
McDougall Minerals Google Search for Cobaltomenite
Mineral News Website Link
Rock and Mineral Shows Google Search for Cobaltomenite
Weinrich Minerals, Inc. Google Search for Cobaltomenite

Ask about Cobaltomenite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Cobaltomenite

CoSeO3•2(H2O)
Dana No: 34.02.03.02 Strunz No: 04.JH.10
Locality:

Notes: