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CoSe4+O3 · 2H2O
dark red, pink-red
2 - 2½

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
Hardness (Mohs):
2 - 2½
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

IMA Formula:
CoSe4+O3 · 2H2O
Elements listed in formula:

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 Volume:
V 433.74 ų (Calculated from Unit Cell)
Crystals minute.

Type Occurrence of Cobaltomenite

Associated Minerals at Type Locality:

Relationship of Cobaltomenite to other Species

Forms a series with Ahlfeldite (see here)
4.JH.05ChalcomeniteCuSe4+O3 · 2H2O
4.JH.10AhlfelditeNiSeO3 · 2H2O
4.JH.10ClinochalcomeniteCuSeO3 · 2H2O
4.JH.15MandarinoiteFe23+(Se4+O3)3 · 6H2O
4.JH.20OrlandiitePb3Cl4(Se4+O3) · H2O
4.JH.25LarisaiteNa(H3O)(UO2)3(Se4+O3)2O2 · 4H2O
28.1.1ChalcomeniteCuSe4+O3 · 2H2O
28.1.2ClinochalcomeniteCuSeO3 · 2H2O
28.1.6Haynesite(UO2)3(Se4+O3)2(OH)2 · 5H2O
28.1.8MarthoziteCu2+(UO2)3(Se4+O3)2O2 · 8H2O
28.1.9GuilleminiteBa(UO2)3(Se4+O3)2O2 · 3H2O
28.1.10DemesmaekeritePb2Cu5(UO2)2(Se4+O3)6(OH)6 · 2H2O
28.1.11MandarinoiteFe23+(Se4+O3)3 · 6H2O
28.1.13AhlfelditeNiSeO3 · 2H2O · 2H2O · 2H2O

Other Names for Cobaltomenite

Name in Other Languages:

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:
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)
[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
  • 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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