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
Madagascar
Not Available
Brittle, UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
Transparent, Transparent to nearly opaque
Gemmological Tables (2004) More from other references