Telyushenkoite
Telyushenkoite is an IMA-recognized mineral species in the silicate class, with the chemical formula CsNa₆Be₂Al₃Si₁₅O₃₉F₂.
It crystallizes in the hexagonal crystal system (space group P-3m1). It is a member of the Leifite structural group.
Key properties: Mohs hardness 6; specific gravity 2.73; White streak; Vitreous luster; optically uniaxial.
IMA symbol Tys, IMA status: approved, named in 2001.
Found in boulders from glacial moraine.
It is found associated with Reedmergnerite, microcline, pectolite, hyalotekite, shibkovite, nordite-(Ce), leucophanite, kentbrooksite, polylithionite, albite.
The mineral was named to honor petrographer and teacher Tamara Matveyevna Telyushenko (1930-1997) for her contributions to understanding the geology of Central Asia and service as head of the Young Ge.