Smokey Quartz is associated with the solar plexus chakra, and known as an excellent ground stone. Many believe it aids in relieving stress and anxiety, while calming a hyperactive mind. Smokey Quartz is also said to disperse fear and lift depression and negativity, while encouraging positive thought and action. Others associate the stone with detoxifying the digestive system, and protecting against radiation. 
Chakras - Base Chakra, Solar Plexus Chakra
Zodiac - Scorpio, Capricorn
Element - Earth/Air
 
Quartz Crystal stone is believed to increase spiritual wisdom and insight, and promote clarity of thought. It’s also believed to increase one’s intuition and amplify prayers. In addition, Quartz Crystal is known to be good for treating headaches, dizziness and general pain relief, as well as healing emotional wounds. Clear Quartz is known as the "master healer" and will amplify energy and thought, as well as the effect of other crystals.
Chakras - Crown Chakra
Zodiac - All Birthsigns 
Element – All (Earth/Fire/Air/Water)