Another negative is its splotchy color distribution, but a skilled gem cutter can work a stone to its own advantage. Euclase is a real treasure in well formed crystals and in colorful gemstones. Color includes colorless, blue-green, blue, yellow, light green and rarely purple. Luster is vitreous. Crystals are transparent to translucent.
Fracture is conchoidal.
Streak is white. Associated Minerals include micas , quartz , topaz , beryl , gold , pericline and some feldspars . Best Field Indicators are crystal habit, good cleavage, striations, hardness and color.