Occurs in Pinal County.
Chemical Formula: MgAl2(SO4)4·22H2O
Specific Gravity: 1.75-1.82
Hardness: 2
Pickeringite is a magnesium aluminum sulfate mineral that often appears as white to pale-colored fibrous masses or coatings. It is found in arid regions as a product of evaporation.
Next Pinal County mineral: Piemontite