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, Southern and central Africa
Vitreous
Waxy, Silky, Resinous, Greasy
Transparent, Transparent to nearly opaque
TranslucentHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)