Sergevanite
Sergevanite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₁₅(Ca₃Mn₃)(Na₂Fe)Zr₃Si₂₆O₇₂(OH)₃·H₂O.
It crystallizes in the hexagonal crystal system (space group R3). It is a member of the Eudialyte structural group.
Key properties: Mohs hardness 5; specific gravity 2.9; White streak; Vitreous luster; optically uniaxial.
IMA symbol Sgv, IMA status: approved, named in 2019.
An accessory component in highly agpaitic foyaite of an alkaline massif.
It is found associated with Microcline, albite, nepheline, arfvedsonite, aegirine, lamprophyllite, fluorapatite, steenstrupine-(Ce), ilmenite, sphalerite.
The name refers to the Sergevan’ River, which is near the discovery locality.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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