Mĕs'o-tȳpe, n.

n. [Fr. mésotype, from Gr. μέσος, middle, and τύπος, type.] (Min.) A zeolitic mineral, occurring in slender crystals, and delicate, radiated concretions, and consisting of the hydrated silicate either of alumina and soda, in which case it is called also soda mesotype, or natrolite, or of alumina and lime, in which case it is called lime mesotype, or scolecite, or of alumina and both lime and soda, in which case it is called mesolite. Dana.