Energy: This crystal is associated with Pluto the Greek god of the underworld and keeper of hidden treasure. Obsidian contains a fiery element as its created by volcanoes. It is helpful for developing the strength needed to stand on your own convictions against any hardships.
Physical: Use Mahogany Obsidian for strength in times of need, to remove energy block, and give new life to your purposes and goals. Healers use it to relieve pain and improve circulation.
Chakra: Solar Plexus, Root
Size, shape and weight vary per stone.