Occurs in Pinal County.
Chemical Formula: CaAl2Si4O12·4H2O
Specific Gravity: 2.3-2.4
Hardness: 3.5-4
Laumontite is a hydrated calcium aluminum silicate mineral that often forms as white, radiating fibrous masses. It is found in low-temperature hydrothermal deposits and zeolite-rich rocks.
Next Pinal County mineral: Leadhillite