Smoky Quartz is used for grounding and protecting against negative energy by transforming it into positive energy. It’s the perfect “pick me up” crystal as it elevates your mood, and helps overcome negative emotions.
Side-note about clusters: Crystal clusters radiate energy out to the surrounding environment and can also absorb detrimental energy. They can be programmed and left in place to do their work. They are especially useful for cleansing a room or other crystals, in which case the crystal can be left overnight on the cluster.