USA, Mexico, Brazil, Switzerland, Sri Lanka, Burma, Madagascar, Color: colorless, light yellow, light pink, Hardness: 7, Refractive index: 1.63 1.64, Density: 2.98 3.03, Chemical composition: Ca(B2Si2O8), Crystal structure: orthorhombic, Origins: USA, Mexico, Brazil, Germany, Switzerland, Sri Lanka, Burma, Madagascar, Japan. Colorless danburites are common, with light pink or yellowish stones being more rare and expensive. Only eye clean pieces are valuable.
Boracite is found in evaporite deposits, Southern and central Africa, anhydrite and/or halite. Arthur Thomas
Yellow, Brown, Colorless, White, gray, Brownish, Yellow
Colorless, White, Yellow, Blue, Green, Colorless, gray, Yellow, White