Greenockite
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Greenockite, also cadmium blende or cadmium ochre is a rare cadmium bearing metal sulfide mineral consisting of cadmium sulfide in crystalline form. Greenockite crystallizes in the hexagonal system. Wikipedia
Chemical formula: CdS
Crystal system: Hexagonal
Cleavage: Distinct on, imperfect on
Crystal class: Dihexagonal pyramidal (6mm); (same H-M symbol)
Formula mass: 144.48
Optical properties: Uniaxial (−)
Space group: P63mc