Formula: Pb2(SO4)O
Origin of name: Locality; Lanarkshire, Scotland
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Rare about [010] axis, polysynthetic
Unit cell: a = 13.75 Ǻ, b = 5.70 Ǻ, c = 7.07 Ǻ, β = 115.8°
Colour: Gray, greenish white, yellow
Diaphaneity:
Luster: Adamantine to resinous
Habit: Crystals prismatic; massive
Hardness: 2 to 2.5
Specific gravity: 6.92
Cleavage: 3; {-201} perfect, {-401} and {201} imperfect
Tenacity: Thin laminae flexible
Streak: White
Synonyms/varieties:
Comments: Fluoresces yellow
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