BLT171 Black Tourmaline Rectangle A-grade Brazilian amethyst displays a

A-grade Brazilian amethyst displays a dark purple color with varying shades

BOTSET712c Botswana Agate Cabochon Lot features 10 cabochons

with occasional hints of blue or yellow

and is surrounded by howlite and black onyx

Displays a brown color with striation markings

BLT171 Black Tourmaline Rectangle A-grade Brazilian amethyst displays aBlack Tourmaline crystal with natural termination. 2" x 1. 75" x 5. 25" 1. 35 lb Black Tourmaline is also called Schorl, and accounts for ninety five percent of all Tourmaline in nature. It is black, or sometimes a deep blue that appears black. The term Schorl was in use before the 1400s, named for a town in Saxony, Germany, where Black Tourmaline was found in nearby tin mines. Black Tourmaline belongs to a complex family of aluminum borosilicate