Global InformationMogovidite information
| Mogovidite | |
|---|---|
| General | |
| Category | Cyclosilicate |
| Formula (repeating unit) | Na9(Ca,Na)6Ca6(Fe3+,Fe2+)2Zr3[]Si25O72(CO3)(OH,H2O)4 (original form) |
| IMA symbol | Mgo[1] |
| Strunz classification | 9.CO.10 |
| Dana classification | 64.1.6 |
| Crystal system | Trigonal |
| Crystal class | Hexagonal scalenohedral (3m) H-M symbol: (3 2/m) |
| Space group | R3m |
| Unit cell | a = 14.23, c = 29.98 [Å] (approximated); Z = 3 |
| Identification | |
| Color | Brown to reddish-brown |
| Crystal habit | grains and crystals |
| Cleavage | No |
| Tenacity | Brittle |
| Density | 2.91 (measured) |
| Optical properties | Uniaxial (−) |
| Refractive index | nω = 1.62, nε = 1.61 (approximated) |
| References | [2][3][4][5] |
Mogovidite is a very rare mineral of the eudialyte group,[3] with formula 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. 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]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Mineralienatlas
- ^ a b c Mindat, Mogovidite, http://www.mindat.org/min-27487.html
- ^ a b c d Chukanov, N.V., Moiseyev, M.M., Rastsvetayeva, R.K., Rozenberg, K.A., and Zadov, A.E., 2005. Golyshevite (Na,Ca)10Ca9(Fe3+,Fe2+)2Zr3NbSi25O72(CO3)(OH)3·H2O, and Mogovidite, Na9(Ca,Na)6Ca6(Fe3+,Fe2+)2Zr3[]Si25O72(CO3)(OH,H2O)4, new eudialyte-group minerals from calcium-rich agpaitic pegmatites of the Kovdor massif, Kola Peninsula. Zapiski Rossiyskogo Mineralogicheskogo Obshchestva 134(6), 36–47 (in Russian, with English abstract)
- ^ Handbook of Mineralogy, Mogovidite, http://www.handbookofmineralogy.org/pdfs/mogovidite.pdf
- ^ Barthelmy, Dave. "Mogovidite Mineral Data". webmineral.com. Retrieved 2016-02-29.