The Collaborative International Dictionary
Epistilbite
Epistilbite \Ep`i*stil"bite\, n. [Pref. epi- + stilbite.] (Min.) A crystallized, transparent mineral of the Zeolite family. It is a hydrous silicate of alumina and lime.
Wiktionary
epistilbite
n. (context mineral English) A triclinic-pedial mineral containing aluminum, calcium, hydrogen, oxygen, and silicon.