(n.) A mineral of the Zeolite family, often occurring in amygdaloid, in foliated masses, and also in monoclinic crystals with pearly luster on the cleavage face. It is a hydrous silicate of alumina and lime.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). heulandite. Retrieved September 22, 2026, from http://smartdefine.org/heulandite/definitions/2016374 |
| Chicago | Webster's. 2011. "heulandite" http://smartdefine.org/heulandite/definitions/2016374 (accessed September 22, 2026). |
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| MLA | Webster's. "heulandite" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/heulandite/definitions/2016374> |