Formula: PbTiO3
Origin of name: After locality; Crni Kamen, Prilep, Macedonia
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: Black with brownish tint
Diaphaneity: Opaque
Luster: Vitreous
Habit: Crystals prismatic, rare; irregular grains, microscopic
Hardness: 5.5
Specific gravity: 7.82
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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