Formula: C
Origin of name: For K. Lonsdale, English crystallographer
Crystal system: Hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell:
Colour: Pale brownish yellow
Diaphaneity:
Luster: Adamantine
Habit: As pseudocubes and pseudocubo-octahedrons
Hardness: 3
Specific gravity: > 3.3
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Polymorphous with diamond, graphite and chaoite; from a few meteorites
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