Image: Andrew Silver (Public domain)
hexagonaluncommonSulfides
Greenockite
CdS
Greenockite is a bright yellow to orange-yellow mineral, often found as crusts, coatings, or small hexagonal crystals, exhibiting an adamantine to resinous luster.
Greenockite Physical Properties
Mohs Hardness
3.5Crystal System
hexagonalLuster
adamantineStreak Color
orange-yellowCleavage
distinct on {1010} and {0001}Fracture
conchoidalSpecific Gravity
4.8Colors
yellow, orange-yellow, brownish-yellow, reddish-brownTransparency
transparentType Locality
Greenock, ScotlandMineral Group
SulfidesUses
minor ore of cadmium, collectorAssociated Minerals
sphalerite, galena, chalcopyrite, pyrite, calcite, quartz, bariteRarity
uncommonGeological Context
It typically forms as a secondary mineral in zinc and lead sulfide deposits, often as an alteration product of sphalerite, or in hydrothermal veins where cadmium is present.
