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Cobaltomenite

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Big Photo

Molly Hogan Group (Parco No. 4 & No. 5), Parco Mine Group, Thompsons District (S. E. Thomsons), Grand Co., Utah, USA
© Brent Thorne

Show Cobaltomenite Photos (16)



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


Ahlfeldite-Cobaltomenite Series

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
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:
  • Look for Cobaltomenite on Google
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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:
  • rare and unusual minerals mainly crystallized
  • Search for minerals at Heliodor
  • Rare and Unusual minerals at Mineralogical Research Company
  • Fine and rare minerals from mintreasure.com
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Find Cobaltomenite on www.crystalclassics.co.uk
  • Cobaltomenite specimens for sale - minfind.com
  • The Arkenstone - Fine Minerals
  • Buy fine minerals and gemstones from Pala International
  • Wilensky Fine Minerals
  • Search for Cobaltomenite on Well-Arranged Molecules
  • Fine Minerals from Weinrich Minerals, Inc.
    • Jobs:
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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.
    Hide Locality List
    (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
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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