A mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium

Usage examples of tourmaline.

So did he take fruit of every color, never suspecting that the red ones might be rubies, carbuncles, hyacinths, corals, or camelians, nor the white ones diamonds, pearls, nacre, or moonstones, nor the green ones emeralds, beryls, jade, prase, or aquamarine, not to mention those many varieties of blue, violet, yellow, and various unknown colors and the fact that they might be sapphires, lapis, turquoise, amethysts, jaspers, topaz, amber, agates, opals, hematite, tourmaline, peridot, and chrysoprase.

Before his talk Gentry had fingered citrines, tourmalines, amethysts, topazes, rose and blue quartz, black onyxes, obsidian, and ordinary pebbles rounded by tumbling in Rocky Mountain streams.

In the middle of the breast and stomach circles, obviously meant to represent navel and nipples, were bright red garnets, and a line of colored stones -- green and pink tourmalines, red garnets, aquamarines -- had been fastened along the flat top of the head.

On Earth he would have suspected tsavorite, emerald or chrome tourmaline, in that order.

The floor was inset with tourmaline, amber, amethyst, aventurine, and other semiprecious stones.

The different shades of green in tourmaline, emerald, peridot and demantoid garnet, that wonderful apricot color of imperial topaz.

Dan had taught her how to distinguish the greens of tourmaline and emerald and the rare demantoid garnets, and as a special treat he let her play the game that was not a game at all but a method of distinguishing between topazes and the less valuable citrines of identical color.

They found many fragments and a few cylindrical segments that had been shafts of tourmaline as long and thick as Chance’s finger before the earth had twisted, fracturing and finally shattering the tourmaline’s crystal integrity.

The merchant princes, grown vastly rich off the trade between the seas, were divided into three jealous factions: the Ancient Guild of Spicers, the Tourmaline Brotherhood, and the Thirteen, to which Xaro belonged.

A tunnel dug for thirty-one years had come upon a fabulous vein of amethyst, containing also rose quartz and the strange black crystalline rods of tourmaline.