Telyushenkoite

Formula: (Cs,Na)Na₆Be₂Al₃Si₁₅O₃₉F₂

Origin of name: Named after Tamara Matveyevna Telyushenko (1930-1997), professor of petrography in the Ashkhabad School of Geology

Crystal system: Trigonal

Crystal class: -3m

Twinning: 

Unit cell: a = 14.377, c = 4.8786

Colour: White to colourless

Diaphaneity: Transparent

Luster: Vitreous

Habit: Angular grains to 2 cm, as inclusions in coarse grained blocks mainly of reedmergnerite

Hardness: 6

Specific gravity: 2.73

Cleavage: 

Tenacity: 

Streak: White

Synonyms/varieties:

Comments:  Cs analogue of leifite