Formula: Ca(Li,Al)3Al6(BO3)3Si6O18
Origin of name: For R. Liddicoat, American gemmologist
Crystal system: Hexagonal
Crystal class: 3m
Twinning:
Unit cell: a = 15.85 Å, c = 7.11 Å
Colour: Green, brown, pink, red
Diaphaneity:
Luster: Vitreous on fracture
Habit: Crystals stout prismatic, striated along c-axis
Hardness: 7.5
Specific gravity: 3.02
Cleavage: None
Tenacity: Brittle
Streak: Very light brown
Synonyms/varieties:
Comments: Series with elbaite
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