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Parkerite

Year of discovery: 1937 (Frood mine, Canada, and Insizwa, South Africa), 1978 (Japan)

Locality list: 7 localities of parkerite

• Ni₃Bi₂S₂
• Ni₃(Bi,Pb)₂S₂
• [Ni²⁺₃][Bi³⁺₂][S₂]

• Class: Sulfide

• Color: Pale yellowish brown
• Streak: Pale yellowish brown
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Rhombic grains formed by cleavage planes
• Twin: Lamellar

• Cleavage: Perfect on {010}, Parting on {111} (2 planes)
• Hardness: 2
• Density: 8.5

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=11.1, b=8.1, c=11.5, β=90.0

Etymology: Professor Robert Luling Parker (1893-1973), Swiss mineralogist.