Russia, Brazil, Tanzania, Madagascar, Zambia, Sri Lanka, Burma, India, Color: color change, from bluish green (daylight) to purple, red or brown (incandescent light), Hardness: 8, Refractive index: 1.74 1.77, Density: 3.68 3.80, Chemical composition: BeAl2O4, Crystal structure: orthorhombic, Origins: Russia, Brazil, Tanzania, Madagascar, Zambia, Sri Lanka, Burma
USA, Brazyl, Switzerland, Tanzania, Madagascar, Russia, Sri Lanka
Green
Colorless, Yellow, pink, Red
Not Available
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle
Transparent, Transparent to nearly opaque
Gemmological Tables (2004) More from other references