You are looking at a Smoky Rock Crystal skull. The skull is 6.6 inches long, from front to back.

Clear Quartz with metallic, golden rutile, copper, or blue/gray titanium fibers that powerfully electrically conduct and amplify energy/thoughts/programming for healing. Intensifies/deepens altered states. Opens Crown/Brown Chakra for meditation, clairvoyance, telepathy, insight. Some make one too spacey or scattered to wear. (Induces Alpha) Stimulates immunity, strength, blue corona, imagery, dreams. Golden fibers may increase radiation protection and health rejuvenation. Each stone's energy/qualities are unique. Androgynous. Helpful with Lung disorders. Contains Rutile in needle-like mineral inclusions. One can find Rutilated versions of most of the types of Quartz discussed thus far. It heightens whatever energetic influence the regular Quartz posses and helps direct that boosted energy to problematic areas.