Halloween stone is a previously unnamed stone (probably of the Jasper family of stones). It's striped gray, black and tan layers bring to mind the thin layers of volcanic ash and sand of deep earth.
Halloween Stone is said to connect one to the spirit realm to access past life information and communicate with the other side. It has traditionally been used by Mexican shamans to ward off evil spirits. It helps to release emotions connected to past traumas and brings peace and comfort.
Since it contains varying shades of black, it can be used for the crown chakra to help connect with your higher slf, and may be an excellent, safeguarding choice at Halloween.