Epsomite

Occurs in Pinal County.

Chemical Formula: MgSO₄·7H₂O

Specific Gravity: 1.67-1.68

Luster: Vitreous to silky

Hardness: 2

Epsomite, also known as “Epsom salt,” is a hydrated magnesium sulfate mineral. It typically forms as colorless to white prismatic crystals and is commonly used for its medicinal and industrial purposes.

Next Pinal County mineral: Eriochalcite