USA, Color: blue or violetish blue, colorless, Hardness: 6 6.5, Refractive index: 1.76 1.80, Density: 3.60 3.68, Chemical composition: BaTiSi3O9, Crystal structure: hexagonal, Lustre: vitreous, Origins: San Benito Country, USA. Very rare collectors stone. Found only in San Benito County, California, USA, with specimens over 2 ct. being extremely rare.
Brazil, Madagascar, Zambia, Sri Lanka, Burma, Russia, USA, Afghanistan
Violet, Blue, Colorless, Blue, pink, White, Colorless
Green, Blue, Yellow, Red, Brown, White, Colorless, Blue, Red, Green, Yellow, pink