Raw Black Tourmaline Cut Base Mineral SpecimenBuy Black Tourmaline with Mica This is a beautiful piece of Black Tourmaline. The bottom is cut flat, so it stands up and is left natural with Mica throughout. It would look striking in a white room with white counters or shelves. Tourmaline is composed of many minerals. One of the many bizarre facts about Tourmaline is its electrical characteristics. Among many crystals and gemstones, it is the only one that can be charged with electrical energy.