Picture is of actual item 
 
The poster child stone for the title of Obsidian, Black Obsidian is as dark as night and is a powerful tool for those seeking protection, grounding, deep-set healing and tearing the fabric of falsity to find the truth.
 
Black Obsidian is  a great accompaniment to your everyday life. Often used in Feng Shui, Black Obsidian is considered a protector of the home and workplace and a dispeller of negative energy.
 
Obsidian is volcanic glass that forms naturally. It comes from the rapid cooling of felsic lava.
Obsidian is naturally black in color and has a glassy texture and a vitreous luster. There are several shades of Obsidian including rainbow, snowflake, gold, and mahogany. Obsidian is hard and brittle and was commonly used for tools. The meaning of Obsidian is safety and grounding.