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Geocronite

Year of discovery: 1839 (Sala mine, Sweden), 1981 (Japan)

Locality list: 3 localities of geocronite

• Pb₁₄Sb₆S₂₃
• Pb₁₄(Sb,As)₆S₂₃
• [Pb²⁺₁₄][Sb³⁺₆][S₂₃]^46-

• Class: Jordanite group < Large 2D fragment Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt
• Soluble in: hot HCl

• Sb => As: Jordanite (Series)

• Color: Light gray, Bluish gray
• Streak: Gray, Bluish gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Platy on {011}, Granular
• Twin: {011}

• Cleavage: Distinct on {011} (1 plane)
• Hardness: 2.5-3
• Density: 6.5

• System: Monoclinic, Pseudoorthorhombic
• Group: 2/m, P2₁/m
• Lattice: a=9.0, b=31.9, c=8.5, β=118.0

Etymology: Grobe or saturn in Greek, or alchemy name of lead