a white or transparent, colorless mineral of the zeolite family, hydrous calcium aluminum silicate, CaAl2Si7O18⋅6H2O, occurring in basic volcanic rocks in the form of crystals with a pearly luster.
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Heulandite is distinguished from stilbite by its crystals and perfect solubility; from apopholite by form of crystals.
Isomorphous with heulandite is the strontium and barium zeolite brewsterite, named after Sir David Brewster.