Smoky quartz is a protective stone, particularly for physical protection, protection from negativity, and psychic protection. It is a grounding and stabilizing stone. It brings calm, centering, lifts depression, removes negative energies and brings happiness. Smoky quartz is also a good luck stone. It can also assist in tapping subconscious wisdom.  Smoky quartz is associated with the root chakra

Average size is .75 to 1 inch