Smoky quartz is a grey, translucent variety of quartz. It ranges in clarity from almost complete transparency to a brownish-gray crystal that is almost opaque. Some can also be black.
Emotionally, smoky quartz is excellent for elevating moods, overcoming negative emotions, and relieving depression. Smoky quartz relieves stress, fear, jealousy, anger and other negative emotions by transforming them into positive energies. It is a helpful stone for enhancing and encouraging courage and inner strength.