'Prehnite' definitions:
Definition of 'Prehnite'
From: GCIDE
- Prehnite \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. [1913 Webster]