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Leadhillite

Year of discovery: 1832 (Susanna mine, UK), 1932 (Japan)

Locality list: 5 localities of leadhillite

• Pb₄(SO₄)(CO₃)₂(OH)₂
• [Pb²⁺₄][(OH)₂|(CO₃)₂|SO₄]^8-

• Class: Sulfate - Carbonate - Hydroxide
• Soluble in: hot Water (Come off thin plates), HNO₃ (with bubbles)
• Fluorescence: UV excitation (Dark yellow)
• Phase transition: Transit to Susannite by heating above 50 degree.
• Substitution pseudomorph: Replaced by Cerussite.

• Polymorph: Macphersonite (Orthorhombic), Susannite (Trigonal, High temperature)

• Color: Colorless, White
• Streak: White
• Luster: Adamantine
• Diaphaneity: Transparent-Translucent

• Habit: Hexagonal platy

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2.5-3
• Density: 6.6

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=9.1, b=20.8, c=11.6, β=90.5