a white-to-brown or red zeolite mineral, a hydrous silicate of calcium and aluminum, occurring in sheaflike aggregates of crystals and in radiated masses.
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Stilbite, stil′bīt, n. a pearly and foliated variety of zeolite.
Heulandite is distinguished from stilbite by its crystals and perfect solubility; from apopholite by form of crystals.
In the cavities of such mixed rocks we often find calcedony, and crystals of mesotype, stilbite, and arragonite.