Presenting you a Beautiful tourmaline specimen combine with quartz and feldspar from Afghanistan Tourmaline is a diverse group of boron silicate minerals celebrated for having one of the broadest color ranges of any gemstone. Known as the "rainbow crystal," it occurs in virtually every shade, including unique multicolored varieties like watermelon tourmaline. Tourmaline is unique for its pyroelectric and piezoelectric properties, meaning it can generate an electrical charge when heated or placed under pressure. Weight: 101 grams