Smoky Quartz is one of the most powerful energetic cleansing and grounding crystals.  This ability to clear negative energy allows for a strong grounding connection to the Earth.  This strong energetic stability is particularly helpful for those who suffer from depression and anxiety.  It's also helpful for protection and detox of Electromagnetic fields and radioactive exposure. 
This gorgeous cluster has the most pure and clear smoky points and weighs 5oz.