Formula: (Ce,La)Ti2(O,OH)6
Origin of name: For Hans Lucas, Australian discoverer of mineral
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Light to dark brown, gray
Diaphaneity: Translucent
Luster: Resinous
Habit: Subhedral grains 0.5 to 1.0 mm
Hardness: 6
Specific gravity:
Cleavage: 1; {001} prominent
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Dimorphous with aeschynite
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