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Cobaltomenite

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Formula:
CoSeO
 
3
· 2H
 
2
O
System:MonoclinicColour:dark red, pink-red
Hardness:2 - 2½

Classification of Cobaltomenite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/K.07-20
Nickel-Strunz 10th (pending) edition ID:4.JH.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
H : Selenites without additional anions, with H2O
Dana 7th edition ID:34.2.3.2
Dana 8th edition ID:34.2.3.2

34 : SELENITES, TELLURITES AND SULFITES
2 : A(XO3)·xH2O
Hey's CIM Ref.:28.1.12

28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites
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Type Occurrence of Cobaltomenite

Type Locality:Cerro de Cacheuta, Sierra de Cacheuta, Mendoza, Argentina
Year of Discovery:1882
Associated Minerals at type locality:
MolybdomeniteChalcomenite

Physical Properties of Cobaltomenite

Colour:dark red, pink-red
Streak:dark pink
Hardness (Mohs):2 - 2½
Cleavage:None Observed

Crystallography of Cobaltomenite

Crystal System:Monoclinic
Cell Parameters:a = 7.64Å, b = 8.82Å, c = 6.51Å
β = 98.6°
Ratio:a:b:c = 0.866 : 1 : 0.738
Unit Cell Volume:V 433.74 ų (Calculated from Unit Cell)
Morphology:Crystals minute.

Optical Data of Cobaltomenite

Type:Biaxial (-)
RI values: nα = 1.681 nβ = 1.728 nγ = 1.769
2V:Measured: 83° , Calculated: 82°
Maximum Birefringence:δ = 0.088

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:Calculated

Chemical Properties of Cobaltomenite

Formula:
CoSeO
 
3
· 2H
 
2
O
Simplified for copy/paste:CoSeO3·2H2O
Essential elements:Co, H, O, Se
All elements listed in formula:Co, H, O, Se

Relationship of Cobaltomenite to other Species

Series:Forms a series with Ahlfeldite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
4.JH.05Chalcomenite
CuSeO
 
3
· 2H
 
2
O
4.JH.10Ahlfeldite
(Ni,Co)SeO
 
3
· 2H
 
2
O
4.JH.10Clinochalcomenite
CuSeO
 
3
· 2H
 
2
O
4.JH.15Mandarinoite
Fe
3+
2
(SeO
 
3
)
 
3
· 4H
 
2
O
4.JH.20Orlandiite
Pb
 
10
(SeO
 
4
)O
 
7
Cl
 
4
· H
 
2
O
4.JH.20UM1999-29-SeO:ClCuHPb
Pb
 
4
Cu(SeO
 
3
)
 
3
(OH)Cl
 
3
4.JH.25Larisaite
Na(H
 
3
O)(UO
 
2
)
 
3
(SeO
 
3
)O
 
2
· 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
28.1.1Chalcomenite
CuSeO
 
3
· 2H
 
2
O
28.1.2Clinochalcomenite
CuSeO
 
3
· 2H
 
2
O
28.1.3Francisite
Cu
 
3
Bi(SeO
 
3
)
 
2
O
 
2
Cl
28.1.4Sofiite
Zn
 
2
(SeO
 
3
)Cl
 
2
28.1.5Molybdomenite
PbSeO
 
3
28.1.6Haynesite
(UO
 
2
)
 
3
(OH)
 
2
(SeO
 
3
)
 
2
· 5H
 
2
O
28.1.7Derriksite
Cu
 
4
(UO
 
2
)(SeO
 
3
)
 
2
(OH)
 
6
· H
 
2
O
28.1.8Marthozite
Cu(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
2
· 7H
 
2
O
28.1.9Guilleminite
Ba(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
4
· 3H
 
2
O
28.1.10Demesmaekerite
Pb
 
2
Cu
 
5
(UO
 
2
)
 
2
(SeO
 
3
)
 
6
(OH)
 
6
· 2H
 
2
O
28.1.11Mandarinoite
Fe
3+
2
(SeO
 
3
)
 
3
· 4H
 
2
O
28.1.13Ahlfeldite
(Ni,Co)SeO
 
3
· 2H
 
2
O
Related Minerals - Dana Grouping):

- +
34.2.3.1Clinochalcomenite
CuSeO
 
3
· 2H
 
2
O
34.2.3.3Ahlfeldite
(Ni,Co)SeO
 
3
· 2H
 
2
O

Other Names for Cobaltomenite

Other Languages:
German:Cobaltomenit
Russian:Кобальтоменит
Spanish:Cobaltomenita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Cobaltomenite

Reference List:

- +
Bertrand (1882) Bulletin de la Société française de Minéralogie: 5: 90.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 639.

Canadian Mineralogist (1974): 12: 304-307.

Neues Jahrbuch für Mineralogie, Monatshefte (1990): 353-362.

Internet Links for Cobaltomenite

Search Engines:
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  • External Links:
  • Look for Cobaltomenite on Webmineral
  • Look for Cobaltomenite on Athena Mineralogy
  • Look for Cobaltomenite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Cobaltomenite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Lapis Mineral Magazin
  • Buy fine minerals and gemstones from Pala International
  • Find Cobaltomenite on www.crystalclassics.co.uk
  • Search for Cobaltomenite on Well-Arranged Molecules
  • Rare and Unusual minerals at Mineralogical Research Company
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  • Localities for Cobaltomenite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Argentina
     
    • Mendoza
      • Sierra de Cacheuta
    Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 639; Canadian Mineralogist (1974) : 12: 304.
    Bolivia
     
    • Potosí Department
      • Antonio Quijarro Province
    [MinRec 21:133]
      • Chayanta Province
        • Pakajake Canyon (Pacajake Canyon)
    [MinRec 32:476]
    Democratic Republic of Congo (Zaïre)
     
    • Katanga (Shaba)
      • Katanga Copper Crescent
        • Kolwezi District
          • Kolwezi
    Gauthier, G. & Deliens, M. (1999): Cobalt minerals of the Katanga Crescent, Congo. Mineralogical Record 30 (4): 255-273
    USA
     
    • Utah
      • Emery Co.
        • San Rafael District (San Rafael Swell)
    Patrick Haynes, FOUR CORNERS MINERAL NEWS in New Mexico Mineral Symposium 2004
      • Grand Co.
        • Thompsons District
          • Yellow Cat District
    Van King specimen
        • Thompsons District (S. E. Thomsons)
          • Parco Mine Group
    Min Rec 26:5 p486
          • Cisco
    Collected by and in the collection of Brent Thorne.
    Collected by and in the collection of Brent Thorne.
      • Piute Co.
    UGMS Bull 117 Minerals and Mineral Localities of Utah
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