Klein, Cornelis Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico.
Last reviewed:November 2019
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A mineral belonging to the zeolite family of silicates. It commonly occurs in well-crystallized groupings of crystals with external rhombohedral symmetry (point group 2/m) with nearly cubic angles. This well-developed external form suggests an internal structure compatible with space group R m; however, one structure refinement suggests lower symmetry (triclinic) with space group P . In addition to recognizing the distinct rhombohedral habit of chabazite crystals, the following physical properties are significant: hardness (on the Mohs hardness scale) in the range 4–5; light colors ranging from white to yellow, pink, and red; vitreous luster; and transparent to translucent in transmitted light. It is distinguished from calcite by a poorer rhombohedral cleavage and lack of effervescent reaction with dilute hydrochloric acid (HCl). See also: Crystal structure
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