Euclase is a rare gemstone. The most attractive color is a pale aquamarine blue, but it also occurs in white, green, and colourless forms. Crystals are prismatic with a perfect cleavage, which means they are fragile and must be cut and handled carefully.
Euclase occurs mainly in pegmatites. Localities include Brazil, Tanzania, Zaire, Kenya, the former USSR, India, Zimbabwe and United States.