PREHNITE

prehnite. Prehnite, n. a siliceous stone of a green apple

---

Prehn″ite (?), n. [[So called from the German Colonel Prehn, who first found it.]] (Min.) A pale green mineral occurring in crystalline aggregates having a botryoidal or mammillary structure, and rarely in distinct crystals. It is a hydrous silicate of alumina and lime.