One of the many members of the quartz family, smoky quartz is the light brown to nearly black variety of crystalline quartz. Typically found at higher elevations, this quartz gets its smoky color from natural radiation caused by gamma rays. Metaphysically, smoky quartz is used for grounding. Fine specimens of smoky quartz are found in Brazil, USA, Switzerland, and Africa.
Tourmaline is a crystal silicate mineral with the broadest color palette of any mineral group. The name derives from the Sinhalese turmali, meaning many-colored gems. Bi-colored and multicolored crystals are common, reflecting variations of fluid chemistry during crystallization. Each color has its own mineral name, including rubellite (red, pink), indicolite (blue), dravite (brown), and schorl (black). Tourmaline is found in Sri Lanka, Brazil, and California. Metaphysically, each color of tourmaline has a specific attribute: schorl is good for protection, rubellite applies to matters of the heart, and indicolite aids with intuition.