Formula: Pb3FeSi4O12(Cl,OH)
Origin of name: For John Jago Trelawney, American mineral collector
Crystal system: Hexagonal
Crystal class: -6m2
Twinning:
Unit cell:
Colour: Yellow-green
Diaphaneity:
Luster: Vitreous
Habit: Platy, fine-grained micaceous aggregates
Hardness: 3
Specific gravity: 5.43
Cleavage: 1; {0001} perfect
Tenacity:
Streak: Yellow
Synonyms/varieties:
Comments:
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