Brazil, Madagascar, Russia, USA, Mexico, Pakistan, brown, Yellow, Orange, Sri Lanka
Brazil, Color: bi-color, violet / yellow, Hardness: 7, Refractive index: 1.54 1.55, Density: 2.65 2.66, Chemical composition: SiO2, Crystal structure: hexagonal, Lustre: vitreous, Origins: Brazil, Bolivia, Uruguay. Ametrine is a bi-color variety of quartz, Yellow, Orange, India
Yellow, Blue, Green, Red, White, Colorless, pink, Brown
Yellow
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Not Available