Russia, Canada, Australia, India, Brazil, Color: colorless, light yellow, brownish. Very rare varieties: red, Not Available, Not Available, yellow. Hardness: 10, Refractive index: 2.42, Density: 3.52, Chemical composition: C, Crystal structure: cubic, Origins: Southern and central Africa, Russia, Canada, Australia, India, Brazil.
USA, Zambia, Madagascar, India, Sri Lanka, Russia, Australia, Color: violet, purple-violet, Hardness: 7, Refractive index: 1.54 1.55, Density: 2.65 2.66, Chemical composition: SiO2, Crystal structure: hexagonal, Lustre: vitreous, Origins: Widespread; main sources are Brazil, Uruguay, Bolivia, Argentina, USA, East Africa, Zambia, Namibia, Madagascar, India, Sri Lanka, Russia, Brazil, Uruguay, Bolivia, Argentina, Australia, Brazil, Uruguay, Bolivia, Argentina, Australia