Formula: (Na,Ca,K)4Ti4(Si,Al)8O26.(H2O,Na)
Origin of name: Named for Alexander Pavlovich Vinogradov, Russian geochemist.
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 5.35, b = 8.56, c = 24.22, β = 101°
Colour: Colourless to white
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals prismatic or fibrous, fibrous aggregates or spherulites
Hardness: about 4
Specific gravity: 2.88
Cleavage: 1; {010} perfect
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments:
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