Kapitsaite-(Y)
Kapitsaite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula Ba₄Y₂Si₈B₄O₂₈F.
It crystallizes in the triclinic crystal system (space group I-1). It is a member of the Hyalotekite structural group.
Key properties: Mohs hardness 5; specific gravity 3.74; White streak; Vitreous luster; optically biaxial.
IMA symbol Ksa-Y, IMA status: approved, named in 1998.
Found in a boulder of peralkaline pegmatite in the moraine of a glacier.
It is found associated with Quartz, reedmergnerite, leucosphenite, polylithionite, pectolite, pyrochlore, turkestanite, aegirine.
The mineral was named to honor Russian P’yotr Leonidovich Kapitsa (1894-1984), well-known solid-state physicist.
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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