The term 'Quartz Mineral' is a type of mineral composed of silicon dioxide. It is one of the most abundant minerals on Earth and is found in many different colors, including white, pink, purple, gray, and black. The crossword solution for this term is 'ONYX', which is a type of quartz mineral that is usually black or dark-colored with white or light-colored bands. ONYX is often used in jewelry and other decorative items.