Hawleyite
Chemical compound
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Hawleyite is a rare sulfide mineral in the sphalerite group, dimorphous and easily confused with greenockite. Chemically, it is cadmium sulfide, and occurs as a bright yellow coating on sphalerite or siderite in vugs, deposited by meteoric water. Wikipedia
Crystal class: Hextetrahedral (43m); H-M symbol: (4 3m)
Crystal habit: Powdery massive
Crystal system: Cubic
Formula (repeating unit): CdS
Luster: Metallic
Space group: F43m