Euclase is a rare beryllium aluminum hydroxide silicate mineral that crystallizes in the monoclinic system.
Chemical composition of BeAlSiO4(OH).
The name euclase derives from the Greek words "Eu", meaning easily, and "klases" meaning fracture, alluding to the excellent cleavage of this mineral.
Euclase is a rare and highly desirable mineral among collectors.
it is usually present in small quantities.
It can form into excellent zoned and intensely colored crystals, and this, combined with its rarity, makes for a very highly collectible gem. Euclase is usually found in beryl deposits, which are often formed from the decomposition of beryl.
Highly transparent, blue and aquamarine crystals of euclase are found in Colombian emerald deposits in Gachalá, Cundinamarca department; and in the La Marina Mine, from Pauna, department of Boyacá-Colombia, has produced deep blue Euclase crystals with an absolutely incredible color:
