Formula: Pb4(SO4)(CO3)2(OH)2
Origin of name: Locality; Leadhills, Scotland
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common on {140}, contact or penetration; on {340}, lamellar; rare about [1-40]axis, contact or lamellar
Unit cell: a = 9.09 Ǻ, b = 20.79 Ǻ, c = 11.56 Ǻ, β = 90.5°
Colour: Colourless, white, gray, yellowish, pale green to pale blue
Diaphaneity:
Luster: Resinous to adamantine
Habit: Crystals pseudohexagonal, thin to thick tabular, prismatic or equant; massive, granular
Hardness: 2.5 to 3
Specific gravity: 6.55
Cleavage: 1; {001} perfect, easy
Tenacity: Conchoidal
Streak:
Synonyms/varieties:
Comments: Trimorphous with macphersonite and susannite; sometimes fluoresces yellow
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