Euclase crystals are of course very hard to obtain. The really blue and gemmy ones are incredibly rare and expensive. The colorless ones are more common, but still, in this quality and size, are quite uncommon! It has a terrific luster and internal shimmer to it. It is crudely trigonal in form looking down the c axis, with the back side cleaved and the other two sides of the triangle showing lustrous and vertical faces.