Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
hexagonaluncommonSulfides
Greenockite
CdS
Greenockite typically forms small, bright yellow to orange-yellow, often pyramidal or tabular crystals, sometimes as coatings or earthy masses. In this image, it appears as vibrant orange-yellow crystals coating a darker matrix, likely cassiterite.
Greenockite Physical Properties
Mohs Hardness
3Crystal System
hexagonalLuster
resinousStreak Color
orange-yellowCleavage
perfect on {0001}Fracture
conchoidalSpecific Gravity
4.5Colors
yellow, orange-yellow, brownish-yellow, reddish-brownTransparency
transparentType Locality
Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, BoliviaMineral Group
SulfidesUses
minor ore of cadmium, collectorAssociated Minerals
cassiterite, sphalerite, galena, pyrite, chalcopyrite, quartz, calcite, bariteRarity
uncommonGeological Context
Greenockite is a rare secondary mineral found in zinc and lead ore deposits, often associated with sphalerite and other sulfide minerals. It forms in hydrothermal veins or as an alteration product of cadmium-bearing minerals.
