Polyakovite-(Ce)
Polyakovite-(Ce) is an IMA-recognized mineral species in the silicate class, with the chemical formula (Ce,Ca)₄MgCr₂(Ti,Nb)₂Si₄O₂₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Chevkinite structural group.
Key properties: Mohs hardness 5.5–6; specific gravity 4.75; Light brown streak; Vitreous luster.
IMA symbol Pak-Ce, IMA status: approved, named in 1998.
Found in a carbonatite vein cutting phlogopite-fluororichterite rock.
It is found associated with Calcite, dolomite, fluororichterite, phlogopite, forsterite, monazite-(Ce), clinohumite, chromite, thorianite.
The mineral was named to honor mineralogist Vladislav O. Polyakov (1950-1993), who began this investigation.
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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