Afghanistan, Southern and central Africa
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, Bolivia, Brazil, India, Yellow, Orange, Bolivia, Brazil, India
Grey, White, Colorless, gray, Pale pink, Blue
Yellow
Not Available
Scorpio, Libra, Virgo, Scorpio, Libra, Virgo, Scorpio
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Not Available
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
SiO2