Formula: Pb4(SO4)(CO3)2(OH)2
Origin of name: after locality Susanna mine, Leadhills, Scotland
Crystal system: hexagonal
Crystal class: -3
Twinning:
Unit cell:
Colour: colourless to greenish or yellowish
Diaphaneity: transparent to translucent
Luster: adamantine to resinous
Habit: crystals acute rhombohedral, with basal pinacoid or hexagonal prism faces
Hardness: 2.5 to 3
Specific gravity: 6.55
Cleavage: 1; {0001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: trimorphous with leadhillite and macphersonite
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