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Koragoite

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About KoragoiteHide

Formula:
(Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20
Lustre:
Metallic
Hardness:
4 - 5
Crystal System:
Monoclinic
Name:
Named after Aleksei Aleksandrovich Korago (1942–1993), geologist who investigated the formation of river pearls in the Arkhangel'sk district of Russia, and the origin of amber.
This page provides mineralogical data about Koragoite.


Classification of KoragoiteHide

Approved
Approval Year:
1994
4.DE.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
8.7.12.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous

Physical Properties of KoragoiteHide

Metallic
Hardness:
4 - 5 on Mohs scale

Chemical Properties of KoragoiteHide

Formula:
(Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20
IMA Formula:
Mn2+2Mn3+Nb2(Nb,Ta)3W2O20

Crystallography of KoragoiteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Cell Parameters:
a = 24.73 Å, b = 5.056 Å, c = 5.760 Å
β = 103.5°
Ratio:
a:b:c = 4.891 : 1 : 1.139
Unit Cell V:
700.30 ų (Calculated from Unit Cell)

Type Occurrence of KoragoiteHide

Synonyms of KoragoiteHide

Other Language Names for KoragoiteHide

German:Koragoit
Spanish:Koragoita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Cassiterite1 photo of Koragoite associated with Cassiterite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.DE.05DowneyiteSeO2Tet.
4.DE.15KoechliniteBi2MoO6Orth. mm2 : Pna21
4.DE.15RusselliteBi2WO6Orth.
4.DE.15TungstibiteSb3+2WO6Orth. 2 2 2
4.DE.20TelluriteTeO2Orth. mmm (2/m 2/m 2/m)
4.DE.25ParatelluriteTeO2Tet.
4.DE.30BismutotantaliteBi(Ta,Nb)O4Orth.
4.DE.30BismutocolumbiteBi(Nb,Ta)O4Orth. mmm (2/m 2/m 2/m)
4.DE.30CervantiteSb3+Sb5+O4Orth.
4.DE.30StibiotantaliteSb(Ta,Nb)O4Orth. mm2
4.DE.30StibiocolumbiteSb(Nb,Ta)O4Orth. mm2
4.DE.30ClinocervantiteSb3+Sb5+O4Mon.
4.DE.35BaddeleyiteZrO2Mon. 2/m : P21/b

Other InformationHide

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 KoragoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Record: 29: 473.
Transactions of the Russian Academy of Sciences/Earth Science Sections: 353A(3): 341-343.
Yamnova, N.A., Pushcharovskii, D.Y., Voloshin, A.V. (1995): Crystal structure of a new natural Mn, W-tantaloniobate. Kristallografiya 40, 469-475.
American Mineralogist (1996): 81: 250.

Internet Links for KoragoiteHide

Localities for KoragoiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
France
 
  • Nouvelle-Aquitaine
    • Corrèze
      • Meymac
Ansermet, S., Cuchet, S. & Meisser, N. (2010): Minéralogie de la mine de La grange, Meymac, Corrèze. Le Règne Minéral, 91: 23-31
Tajikistan (TL)
 
  • Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni)
    • Pamir Mts
      • Khorog Region
        • Shakhdara Range
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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