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Mogovidite

Mineral of the eudialyte group From Wikipedia, the free encyclopedia

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Mogovidite is a very rare mineral of the eudialyte group,[3] It is similar to feklichevite, differing from it in the presence of essential vacancies (at the M3 site) and carbonate group.[4] Another specific feature is the dominance of ferric iron – a feature shared with other eudialyte-group members, including feklichevite, fengchengite, golyshevite and ikranite. Similarly to golyshevite, it is calcium-dominant, however on three (not two) sites: M(1), N(3) and N(4).[3][4] It has a molecular mass of 3,066.24 gm.[6] Mogovidite's formula given as Na9(Ca,Na)6Ca6(Fe3+,Fe2+)2Zr3[]Si(Si9O27)2(Si3O9)2(CO3)(OH,H2O)4.[4] The formula given is based on the original one but extended to show the presence of cyclic silicate groups.

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Occurrence and association

As golyshevite, mogovidite was discovered in calcium-bearing peralkaline pegmatites of the Kovdor massif, Kola Peninsula, Russia. The mineral name is of geographical origin – mogovidite is named after Mt. Mogo-Vid located in the vicinity of type locality. Association of mogovidite: aegirine-augite, andradite, calcite, humite, nepheline, pectolite, scolecite, titanite, zircon.[4]

Notes on chemistry

Chemical impurities in mogovidite include chlorine, potassium, and manganese, with trace titanium, cerium, and lanthanum.[4]

References

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