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Nickeline (Photo)

Year of discovery: 1694 (World), 1907 (Japan)

Locality list: 42 localities of nickeline

• NiAs
• [Ni³⁺][As]^3-

• Class: Nickeline group
• Class: Arsenide
• Insoluble in: HCl
• Odor: Garlic odor (by heating)

• Ni => Rh: Cherepanovite
• Ni => Co: Langisite
• Ni => (Co,Fe): Modderite
• Ni => (Fe,Ni,Co): Westerveldite
• Ni => (Rh,Ni): Ruthenarsenite

• As => Sb: Breithauptite
• As => Se: Sederholmite

• Color: Copper red
• Tarnish: Dark gray, Black
• Streak: Dark brown
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: Imperfect on {1010} and {0001} (4 planes)
• Hardness: 5-5.5
• Density: 7.8

• System: Hexagonal
• Group: 6/mmm, P6₃/mcm
• Lattice: a=3.6, c=5.0

Etymology: Chemical composition

Synonym: Niccolite