Formula: Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7.2H2O
Origin of name: from combination of symbols for elements in composition
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: dark grass-green
Diaphaneity:
Luster: vitreous to silky
Habit: as fibers 0.01 to 0.1 mm across forming asbestiform aggregates to 15 mm
Hardness: 2 to 3
Specific gravity: 2.7
Cleavage: 2; {010} and {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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