Smoky quartz is a brownish grey, translucent type of quartz that may be sometimes almost-opaque brownish-gray or black crystals. The smoky appearance is due to aluminum impurities. Smoky quartz is known for its grounding, protective, and healing properties. It absorbs negative energy and promotes emotional balance. It also provides relief from stress, anxiety, and feelings of inadequacy. It is also believed to enhance mental clarity and focus.