Category:Heulandite

Heu"land*ite, n. Etym: [After Heuland, an English mineralogist.] (Min.)

Defn: 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.