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Millerite [abbr. Mlr ]

Year of discovery: 1845 (Jáchymov, Czech), 1931 (Japan)

Locality list: 60 localities of millerite

• NiS
• β-[Ni²⁺][S]^2-

• Class: Sulfide
• Magnetism: Paramagnetic (After heating)

• Ni => Cd: Hawleyite (α), Greenockite (β)
• Ni => Zn: Sphalerite (α), Wurtzite (β)
• Ni => Fe: Rudashevskyite, Troilite
• Ni => Hg: Metacinnabar (α), Cinnabar, Hypercinnabar
• Ni => Mn: Alabandite (α), Rambergite (β)
• Ni => Cu: Covellite

• S => Se: Makinenite

• Color: Pale yellow
• Tarnish: Iridescent, Greenish gray
• Streak: Greenish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Acicular elongated to [0001]
• Aggregate: Radial

• Cleavage: Perfect on {1011} and {0112} (6 planes)
• Hardness: 3-3.5
• Density: 5.4

• System: Trigonal
• Group: 3m, R3m
• Lattice: a=9.6, c=3.1

Etymology: William Hallowes Miller (1801-1880), British mineralogist who invented Miller Index.