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Gersdorffite (Photo)

Year of discovery: 1845 (Zinkwand, Austria), 1907 (Japan)

Locality list: 51 localities of gersdorffite

• NiAsS
• [Ni²⁺][As³⁺][S]^2-

• Class: Cobaltite group
• Class: Sulfide

• Ni => Co: Cobaltite (Series)
• Ni => Pt: Platarsite
• Ni => Ir: Irarsite
• Ni => Rh: Hollingworthite
• Ni => Os: Osarsite
• Ni => Ru: Ruarsite
• Ni => Fe: Arsenopyrite

• As => Sb: Ullmannite

• Color: Silver white, Grayish black
• Streak: Grayish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Octahedral, Cubic, Penta-dodecahedral
• Striation: Similar to pyrite
• Twin: (-101)

• Cleavage: Perfect on {100} (3 planes)
• Hardness: 5.5
• Density: 5.9

• System: Cubic (P213, Pa3, Pca21) (Layer-stacking polytype)
• Group: m3, Pa3
• Lattice: a=5.7

Etymology: von Gersdorffs, Australian mine owner in 1840's