Obsidian is a naturally created glass. It is formed form volcanic lava which cooled too quickly for significant crystallization to occur. It is most often black, but colors such as gray, brown, and less likely but evident still is red, blue and green. These colors may be uniform, spotted or banded. This coloring is caused by the presence of titanium, iron or manganese.
Obsidian is a very powerful stone, one which reminds us that birth and death are simultaneously and constantly present, one with the other, always as one. This is a stone that has always been associated with guardian spirits that watch over us, and is connected to protection on all levels.