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Clausthalite

Year of discovery: 1832 (St Lorenz mine, Germany), 1956 (Japan)

Locality list: 5 localities of clausthalite

• PbSe
• [Pb²⁺][Se]^2-

• Class: Galena group
• Class: Selenide
• Soluble in: HCl

• Se => S: Galena (Series)
• Se => Te: Altaite

• Color: Lead gray
• Streak: Grayish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Granular, Foliate

• Cleavage: Distinct on {001} (3 planes)
• Hardness: 2.5
• Density: 8

• System: Cubic
• Group: m3m, Fm3m
• Lattice: a=6.1

Etymology: Clausthal in German