paraiba tourmaline

Product details

Absorption Spectrum. Usually not diagnostic for tourmalines. ... Birefringence. 0.013-0.024. Birthstone. October. Cleavage. None. Colors. Neon blue, greenish blue, blue-green, green, mint green, and, very rarely, violet, purple, and pink. Crystallography. Hexagonal (trigonal) Dispersion. ... Enhancements.