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UM1984-37-SiO:CrMn

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Formula:
Mn2+3(Cr3+,Mn3+)2Si3O12
Unique combination of elements. The Cr analogue of 'blythite', calderite, momoiite, and spessartite; the Mn2+ analogue of uvarovite and knorringite (if it truly belongs to the garnet supergroup).

Found as rounded to spherical inclusions, 1 to 30 microns in size, in Cr- and Ni-bearing grains of γ-Fe in alluvial sands from a Pt-bearing serpentinite from an unspecified locality of the Russian Far East. Larger grains are chemically zoned. Some analyses correspond to a Ti- and Cr-enriched variety of 'blythite'.


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Chemical Properties of UM1984-37-SiO:CrMnHide

Formula:
Mn2+3(Cr3+,Mn3+)2Si3O12

Relationship of UM1984-37-SiO:CrMn to other SpeciesHide

Other Members of this group:
Berzeliite Group
Bitikleite Group
BlythiteMn2+3Mn3+2[SiO4]3
CryolithioniteNa3Li3[AlF6]2Iso. m3m (4/m 3 2/m) : Ia3d
Garnet GroupX3Z2(SiO4)3
Henritermierite Group
KatoiteCa3Al2(SiO4)3-x(OH)4x (x = 1.5-3)Iso.
KhohariteMg3Fe3+2(SiO4)3
MonteneveiteCa3Sb5+2(Fe3+2Fe2+)O12Iso. m3m (4/m 3 2/m) : Ia3d
NikmelnikoviteCa12Fe2+Fe3+3Al3(SiO4)6(OH)20Trig. 3 : R3
Schorlomite Group
SkiagiteFe2+3Fe3+2[SiO4]3
YafsoaniteCa3Zn3(TeO6)2Iso. m3 (2/m 3)

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 UM1984-37-SiO:CrMnHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rudashevskii, N.S., Mochalov, A.G. (1984): New associations of native elements in ultrabasites. Geologiya i Geofizika: 25: 38-44 (in Russian, also in English); in: Jambor, J.L., Grew, E.S., Puziewicz, J., Vanko, D.A., (1988): New mineral Names. American Mineralogist: 73: 445
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se (2016)

Internet Links for UM1984-37-SiO:CrMnHide

Localities for UM1984-37-SiO:CrMnHide

ⓘ - 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.
Russia
 
Rudashevskii, N.S., Mochalov, A.G. (1984): New associations of native elements in ultrabasites. Geologiya i Geofizika: 25: 38-44 (in Russian, also in English); in: Jambor, J.L., Grew, E.S., Puziewicz, J., Vanko, D.A., (1988): New mineral Names. American Mineralogist: 73: 445
 
Mineral and/or Locality  
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