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a mineral of the zeolite group, with the chemical composition (Ca, Na2, K2)Al2Si3–8O10–20(5.4–9.4)H2O and ad mixtures of Ba or Sr. Chabazite crystallizes in the trigonal system, forming rhombohedral crystals up to several centimeters in size. It also occurs in the form of crystalline aggregates and massive cryptocrystalline crusts. Chabazite is white or brownish, with a hardness of 4–5 on Mohs’ scale and a density of 2,080–2,160 kg/m3. It is formed in the pores and amygdules of effusive rocks and replaces volcanic tuff when acted upon by solutions of varied origin. It also occurs in hydrothermal veins and hot springs beds. Commercial deposits of chabazite are located in Bowie, Ariz. Structural analogues of chabazite have been synthesized. (See alsoZEOLITES.)