USA, Brazyl, Switzerland, Tanzania, Madagascar, Russia, Sri Lanka
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
Colorless, Yellow, pink, Red
Green
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle
Not Available
Gemmological Tables (2004) More from other references
Transparent, Transparent to nearly opaque