Phillipsite

K(Ca_0.5,Na)₂(Si₅Al₃)O₁₆ .6H₂O

This sample of Phillipsite is displayed in the Smithsonian Museum of Natural History. Phillipsite is a silicate mineral of calcium, potassium and sodium. As an aluminum silicate, it is part of the zeolite group. The composition of this sample is listed as K(Ca_0.5,Na)₂(Si₅Al₃)O₁₆.6H₂O. Sometimes Phillipsite is indicated with suffix -K, -Ca, -Na, depending upon which ion is dominant. This specimen is about 16 cm wide and is from Richmond, Victoria, Australia.

Mindat: Phillipsite