Euclase
3849.jpg")
![Euclase, 3.0 x 1.6 x 1.6 cm. Lost Hope Mine, Mwami, Mashonaland West Province, Zimbabwe](/Images/godic/202501/12/Euclase-219983849.jpg")
Euclase is a beryllium aluminium hydroxide silicate mineral (BeAlSiO4(OH)). It crystallizes in the monoclinic crystal system and is typically massive to fibrous as well as in slender prismatic crystals. It is related to beryl (Be3Al2Si6O18) and other beryllium minerals. It is a product of the decomposition of beryl in pegmatites.