Black Obsidian Skull #2 measure approximately 2 13/16" x 1 3/4" x 2" (70mm x 43mm x 50mm) and weigh approximately 6.9 ounces (174.8 grams).
(Healing Crystal, Grounding and Protecting Crystal)
Obsidian is more or less volcanic glass that comes in a range of colors. Most Obsidian is black and is very grounding and protecting. Obsidian is more connected to Mother Earth than other grounding crystals; the connection is quite strong. It shields you against negativity. It is useful to help healers see the cause of dis-ease.