Na₂(Al₂Si₄O₁₂).2H₂O

These samples of analcime are displayed in the Smithsonian Museum of Natural History. Analcime is a sodium aluminum silicate of the zeolite group with the composition Na₂(Al₂Si₄O₁₂).2H₂O. This sample is described as analcime with calcite and heulandite. It is about 5x11 cm and is from Paterson, New Jersey.

This sample is described as analcime with serandite and natrolite. It is about 4x8 cm and is from Mont Saint-Hilaire, Quebec, Canada.