Formula: Pb4(SO4)(CO3)(OH)2
Origin of name: For Harry Macpherson, Scottish mineral curator
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: White to pale amber
Diaphaneity:
Luster: Adamantine, resinous
Habit: Crystals tabular, euhedral, elongate on b-axis, or pseudohexagonal tabular to micaceous
Hardness: 2.5 to 3
Specific gravity: 6.55
Cleavage: 1; {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Trimorphous with leadhillite and susannite
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