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
Afghanistan, China, Madagascar, Southern and central Africa, Pakistan, Sri Lanka, USA
Green
Red, Reddish, orange, Brown
Transparent, Transparent to nearly opaque
Gemmological Tables (2004) More from other references