Tourmalinated Quartz is another variety of transparent quartz, valued because of it's inclusions. It is a more rare member of the Included Quartz group. Tourmaline is a common accessory mineral in igneous and metamorphic rocks and can form nice crystals. Quartz is usually included with two types of tourmaline. Iron rich black schorl and green elabite. These earrings are heavily included so they are pretty dark in just ambient lighting. However the schorl tourmalines are quite interesring when held up to the light and inspected.