Formula: 3PbCl2 . PbCO3 . H2O
Origin of name: For Richard Barstow, Cornish mineral dealer
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: White
Diaphaneity: Transparent
Luster: Adamantine
Habit: Subparallel elongate intergrown crystals 0.2-0.5 mm in aggregates to 3 mm
Hardness: 3
Specific gravity: 5.50 to 5.69
Cleavage: 1; imperfect prismatic
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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