Bible Dictionaries
Heulandite
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Heulandite'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/h/heulandite.html. 1828.