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, Southern and central Africa
Not Available
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
BeAl 2 O 4
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Transparent, Transparent to nearly opaque
Gemmological Tables (2004) More from other references