Formula: NaBeSi3O7(OH)
Origin of name: From Greek for good and twin
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: White or colourless, gray, yellow, blue, violet
Diaphaneity: Transparent to translucent
Luster: Vitreous, pearly on cleavage
Habit: Crystals tabular; coarsely crystalline; finely crystalline to cryptocrystalline; spherulitic
Hardness: 6 to 7
Specific gravity: 2.55
Cleavage: 2; {001} perfect, {100} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with epididymite
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