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Greenockite (Photo)

Year of discovery: 1840 (Bishopton tunnel, UK), 1903 (Japan)

Locality list: 72 localities of greenockite

• CdS
• β-[Cd²⁺][S]^2-

• Class: Sulfide
• Soluble in: HCl

• Polymorph: Hawleyite (α, Cubic)

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

• S => Se: Cadmoselite

• Color: Orange, Deep red
• Streak: Orange-Reddish brown
• Luster: Adamantine
• Diaphaneity: Translucent-Opaque

• Habit: Pyramidal (never be bipyramidal)
• Aggregate: Earthy
• Twin: rarely {11-22}

• Cleavage: Perfect on {1122} (3 planes), {0001} (1 plane)
• Hardness: 3-3.5
• Density: 4.8

• System: Hexagonal
• Group: 6mm, P6₃mc
• Lattice: a=4.1, c=6.7

Etymology: Greennock in UK, where was ruled by Charles Murray Cathcart (1783-1859)