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Jamesonite (Photo)

Year of discovery: 1825 (Cornwall, UK), 1894 (Japan)

Locality list: 43 localities of jamesonite

• Pb₄FeSb₆S₁₄
• [Pb²⁺₄][Fe²⁺][Sb³⁺₆][S₁₄]^28-

• Class: Jamesonite subgroup < Boulangerite group < Rod-type Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt
• Soluble in: hot HCl
• Substitution pseudomorph: Replaced by Oxyplumboroméite (Oxyplumboromeite).
• Impossible to distinguish from Boulangerite.

• Fe => Mn: Benavidesite (Series)

• Color: Grayish black
• Tarnish: Iridescent
• Streak: Grayish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Acicular along [001]
• Aggregate: Filform
• Striation: [001]
• Twin: {100}

• Cleavage: Good on {001} and {010} (2 planes)
• Hardness: 2.5
• Density: 5.6

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=4.0, b=19.1, c=15.8, β=91.7

Etymology: Robert Jameson (1774-1854), Scottish mineralogist