Definitions Found:
A rare mineral occurring as emerald green or blue-green crystals. It consists of a hydrated silicate of copper
- dioptaseA rare mineral occurring as emerald green or blue-green crystals. It consists of a hydrated silicate of copper
- euclasea 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
- dumortieriteA rare blue or violet mineral occurring typically as needles and fibrous masses in gneiss and schist. It consists of an aluminum and iron borosilicate
- euclaserare green or blue mineral, beryllium aluminum silicate, BeAlSiO4(OH), occurring in prismatic crystals