Black Obsidian
Black color 
Astrological signs: Sagittarius
Chakra correspondences: 1st chakra: root
Black obsidian protects and promotes creativity, masculine qualities and intuition.
On a physical level, black obsidian promotes digestion and the survival instinct
On a spiritual and emotional level, black obsidian is beneficial for shamanic healing and catoptromancy. It is an anchor stone.
*The above information has not been scientifically proven, but is based on the experiences and results of users and therapists. The healing properties described are in no way intended to replace diagnosis or treatment by a qualified therapist or doctor.