Formula: Mg6TlAl6Si8O28(OH)10
Origin of name: For François Ellenberger, French geologist
Crystal system: Hexagonal
Crystal class: 6
Twinning:
Unit cell:
Colour: Purple to lilac
Diaphaneity: Transparent
Luster: Vitreous
Habit: Anhedral around 1 mm, rarely as hexagonal prisms to 10 mm
Hardness: 6.5
Specific gravity: 3.15
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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