Shibkovite
Shibkovite is an IMA-recognized mineral species in the silicate class, with the chemical formula K₂Ca₂(Zn₃Si₁₂)O₃₀.
It crystallizes in the hexagonal crystal system (space group P6/mcc). It is a member of the Milarite structural group.
Key properties: Mohs hardness 5.5–6; specific gravity 2.89; White streak; Vitreous luster; optically uniaxial.
IMA symbol Sko, IMA status: approved, named in 1997.
Found in coarse-grained microcline-quartz rocks in glacial moraine.
It is found associated with Reedmergnerite, aegirine, polylithionite, sogdianite, albite, pyrochlore, pectolite, eudialyte-group minerals, turkestanite.
The mineral was named to honor Russian geologists V.S. Shibkov (1926-1992) and N.V. Shibkov (1951-1991).
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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