Mogovidite
A very rare carbonate-bearing eudialyte-group mineral — like feklichevite but with structural vacancies.
Intro adapted from Wikipedia (CC BY-SA).
Mogovidite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₉(Ca,Na)₁₂Fe₂Zr₃Si₂₅O₇₂(CO₃)(OH)₄.
It crystallizes in the hexagonal crystal system. It is a member of the Eudialyte structural group.
Key properties: Mohs hardness 5.5; specific gravity 2.9; White streak; Vitreous luster; optically uniaxial.
IMA symbol Mgo, IMA status: approved, named in 2004.
Found in a nepheline-pectolite vein within ijolite.
It is found associated with Nepheline, pectolite, aegirine-augite, zircon, titanite, humite, andradite, scolecite, calcite.
The name refers to the mountain, Mogo-Vid, near the locality from which the first specimens were collected.