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
Southern and central Africa
Green
White, Colorless, gray, Yellow
Not Available
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Transparent, Transparent to nearly opaque
Gemmological Tables (2004) More from other references