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CoSeO3 · 2H2O
dark red, pink-red
2 - 2½
Crystal System:

Classification of Cobaltomenite

Approved, 'Grandfathered' (first described prior to 1959)

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 ed.:

2 : A(XO3)·xH2O

28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites

Physical Properties of Cobaltomenite

dark red, pink-red
dark pink
2 - 2½ on Mohs scale
None Observed

Optical Data of Cobaltomenite

Biaxial (-)
RI values:
nα = 1.681 nβ = 1.728 nγ = 1.769
Measured: 83° , Calculated: 82°
Max Birefringence:
δ = 0.088
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of Cobaltomenite

CoSeO3 · 2H2O
IMA Formula:
CoSe4+O3 · 2H2O

Crystallography of Cobaltomenite

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

Type Occurrence of Cobaltomenite

Associated Minerals at Type Locality:

Other Language Names for Cobaltomenite

Relationship of Cobaltomenite to other Species

Forms a series with:

Common Associates

Associated Minerals Based on Photo Data:
Chalcomenite2 photos of Cobaltomenite associated with Chalcomenite on
Clinochalcomenite2 photos of Cobaltomenite associated with Clinochalcomenite on
Trogtalite1 photo of Cobaltomenite associated with Trogtalite on
Derriksite1 photo of Cobaltomenite associated with Derriksite on
Demesmaekerite1 photo of Cobaltomenite associated with Demesmaekerite on

Related Minerals - Nickel-Strunz Grouping

4.JH.05ChalcomeniteCuSeO3 · 2H2O
4.JH.10Ahlfeldite(Ni,Co)SeO3 · 2H2O
4.JH.10ClinochalcomeniteCuSeO3 · 2H2O
4.JH.15MandarinoiteFe3+2(SeO3)3 · 4H2O
4.JH.20OrlandiitePb3(SeO3)(Cl,OH)4 · H2O
4.JH.25LarisaiteNa(H3O)(UO2)3(SeO3)O2 · 4H2O

Related Minerals - Hey's Chemical Index of Minerals Grouping

28.1.1ChalcomeniteCuSeO3 · 2H2O
28.1.2ClinochalcomeniteCuSeO3 · 2H2O
28.1.6Haynesite(UO2)3(OH)2(SeO3)2 · 5H2O
28.1.8MarthoziteCu2+(UO2)3(SeO3)2O2 · 8H2O
28.1.9GuilleminiteBa(UO2)3(SeO3)2(OH)4 · 3H2O
28.1.10DemesmaekeritePb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2O
28.1.11MandarinoiteFe3+2(SeO3)3 · 4H2O
28.1.13Ahlfeldite(Ni,Co)SeO3 · 2H2O

Related Minerals - Dana Grouping (8th Ed.) · 2H2O,Co)SeO3 · 2H2O

Other Information

Health Risks:
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:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 URL:
Please feel free to link to this page.

Localities for Cobaltomenite

This 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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
  • Mendoza
    • Luján de Cuyo department
      • Cacheuta
        • 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.
Ahlfeld Friedrich and Angelelll Vlctorio 1948 Las especies minerales de la Republica Argentina Univ Nac Tucumftn Inst Geologla y Mineria Jujuy Pub no 458 p 47 48 49 50 54 67 69 70 71 120 121 133 134
  • Potosí Department
    • Antonio Quijarro Province
[MinRec 21:133]
    • Chayanta Province
      • Pakajake Canyon (Pacajake Canyon)
Petrov, A., Smith, B., Smith, C. (2001) A Guide to Mineral Localities in Bolivia. Mineralogical Record Vol.32(6), pp. 457-482.
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
  • 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
        • The Poison Strip
Collected by and in the collection of Brent Thorne.
        • Yellow Cat Mesa
Collected by and in the collection of Brent Thorne.; Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Lykova, I.S. (2014): Nestolaite, CaSeO3·H2O, a new mineral from the Little Eva mine, Grand County, Utah, USA. Mineralogical Magazine, 78, 497-505.
          • Parco Mine group
Min Rec 26:5 p486
Rick Dalrymple Collection
Chuck Adan specimen. Visual indentification.
    • Piute Co.
UGMS Bull 117 Minerals and Mineral Localities of Utah
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