Image: Bureau of Mines (Public domain)
trigonaluncommonCarbonates
Smithsonite
ZnCO₃
This specimen displays a botryoidal (grape-like) aggregate of greenish-blue smithsonite, exhibiting a waxy to vitreous luster. The rounded, bubbly texture is characteristic of its common habit.
Smithsonite Physical Properties
Mohs Hardness
4Crystal System
trigonalLuster
vitreousStreak Color
whiteCleavage
perfect rhombohedral {1011}Fracture
unevenSpecific Gravity
4.35Colors
blue, green, yellow, pink, purple, brown, white, grayTransparency
transparentType Locality
Kelley Mine, Socorro County, New MexicoMineral Group
CarbonatesUses
ore of zinc, collector's specimens, minor gemstoneAssociated Minerals
hemimorphite, cerussite, anglesite, galena, sphalerite, calciteRarity
uncommonGeological Context
Smithsonite is a secondary mineral that forms in the oxidized zones of zinc-rich ore deposits, typically as an alteration product of primary zinc sulfides like sphalerite. It often occurs in limestone or dolomite host rocks.
