This is a Smokey Quartz Crystal Rough .One of the best grounding stones,  it is also great for concentration and if you often have nightmares.

Emotional Connection: Relieves fear, dissipates nervousness, anxiety and emotional stress.

Spiritual Connection: It is a grounding and cleansing stone, it blocks geopathic stress, absorbs electromagnetic smog in the environment. Repels negative vibrations out of your aura and only allows positive vibes to remain

Chakra: Root and Sacral

Zodiac: Capricorn and Sagittarius.