EUCLASE
- a mineral (a naturally occurring inorganic substance having a characteristic set of physical properties) [n EUCLASES]
- rare green or blue mineral, beryllium aluminum silicate, BeAlSiO4(OH), occurring in prismatic crystals
- a mineral that consists of a brittle silicate of beryllium and aluminum in pale yellow, green, or blue prismatic crystals and is used especially as a gemstone