Occurs in Pinal County.
Chemical Formula: SnO2
Specific Gravity: 6.9-7.1
Luster: Adamantine to submetallic
Hardness: 6-7
Cassiterite is a tin oxide mineral that is the primary ore of tin. It can vary in color from brown to black and often forms dense, heavy crystals in granitic rocks.
Next Pinal County mineral: Celadonite