SMALL CRYSTALS IN A TYPICAL BALL OF BLUE/GREEN SMITHSONITE WITHIN A SMALL GEODE. PIECE EXTRACTED IN EL MOLÁ, TARRAGONA)
Smithsonite is a zinc carbonate, which generally crystallizes rhombohedral.
We usually find it associated with the blenda.
The colors when it crystallizes are brown, grayish or greenish.
It is often mistakenly called "Calamine".
