Black Obsidian Skull #4 measure approximately 2 7/8" x 1 11/16" x 2" (72mm x 43mm x 52mm) and weigh approximately 7.6 ounces (192.2 grams). This one has a smooth nick in the top of his head on the left side.
(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.