Formula: BaNa(Na,Ti)4(Ti,Nb)2Si4O14(OH,O)3(OH,F)2·3H2O
Origin of name: For A. V. Bykova (1917–2001), whose work predicted the existence of a natural hydrated analogue of bornemanite
Crystal system: Monoclinic
Crystal class:
Twinning:
Unit cell: a = 5.552, b = 7.179, c = 50.94, γ = 91.10°
Colour: Creamy white or pale yellow
Diaphaneity: Semi-transparent
Luster: Silky
Habit:
Hardness: 3
Specific gravity: 2.98
Cleavage: [001 perfect, [100] good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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