Formula: Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2
Origin of name: From Greek for shining and leaf
Crystal system: Monoclinic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Golden brown to dark brown
Diaphaneity: Translucent
Luster: Vitreous, semimetallic when weathered
Habit: Crystals tabular, elongated; stellate aggregates; fine acicular segregations
Hardness: 2 to 3
Specific gravity: 3.44 to 3.53
Cleavage: 1; {100} perfect, micaceous
Tenacity:
Streak: Pale yellow, orange tint
Synonyms/varieties:
Comments:
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