Colombia, Color: Red, Orangey Red, Orange, Yellow, color shift to Green, Hardness: 6 6.5, Refractive index: 1.55 1.56, Density: 2.66 2.70, Chemical composition: (Na, Ca)(Si, Al)4O8, Crystal structure: triclinic, Origins: Congo, Tibet.
India, Canada, Brazil
Red, Yellow, White, gray, Green, Yellow, Red, Colorless, gray, Yellow, Green, White
Colorless, Reddish, White, pink, Green, Yellow, Violet, White, pink, Green, Yellow, Violet, White, Colorless, Blue, Green, Brown, Yellow, pink, Violet, White, pink, Green, Yellow, Violet
Uneven, Uneven, Conchoidal, Uneven, Gems, Sixth Edition (2006)
Uneven, UnevenArthur Thomas, Gemstones (2009)