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, East Africa, Namibia, Brazil
Austria, Zimbabwe, Australia
Violet, White, Colorless, Blue, Red, Green, Yellow, pink
Red, Brown, Violet
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Uneven, Subconchoidal, Conchoidal, Brittle