OBSIDIAN PHYSICAL PROPERTIES Color:black, mahogany, brown, with white spots (snowfall obsidian) HEALING AND SPIRITUAL PROPERTIES: The obsidian has the property of favoring the meditation. It is known as the stone of the justice. It is the effective stone to treat depressions, anxiety and nervous conditions. This is indicated against local pains, arthritis and rheumatism. It opens the crown chakra. It has affinity with the signs of: Aquarius, Cancer, Virgo, Taurus and Scorpio .