Well-formed crystals of green tourmaline from northwestern Zambia show a growth pattern reminiscent of trapiche emerald/ruby when sliced perpendicular to the c-axis. In fact, such slices were ...

Tourmaline ranges in color from black or white to vibrant shades of red, green, and blue. The color of the best Maine tourmalines rival tourmaline from world-famous localities in California, Brazil, ...

Figure 1. This specimen of dark blue tourmaline on micaceous matrix, from the Koksha Valley of Badakhshan Province in Afghanistan, measures 28 × 25 × 17 mm. Photo by Kevin Schmacher. Around a dozen ...