Afghanistan, Pakistan, Burma, Brazil, Madagascar, USA, Canada, Russia, Mexico
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
Colorless, pink
Violet, White, Colorless, Blue, Red, Green, Yellow, pink
Gemstones of the world (2001), UnevenWalter Schumann
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)