Erionite-K

Occurs in Pinal County.

Chemical Formula: (K₂,Ca,Na₂)₂[Al₄Si₁₄O₃₆]·15H₂O

Specific Gravity: 1.5-1.7

Luster: Vitreous to silky

Hardness: 3.5-4

Erionite-K is a hydrated potassium sodium calcium aluminum silicate mineral that forms as white to colorless fibrous masses. It is a type of zeolite mineral.

Next Pinal County mineral: Famatinite