Colours and markings vary between crystals. This is for 1 Black Obsidian crystal chunk (natural), which will be chosen for you.
About Black Obsidian Crystals
Black Obsidian, named after the Roman Obsius, is actually molten lava (volcanic glass) which has cooled extremely quickly. It is a lightweight, translucent crystal and because Black Obsidian is a natural glass, it is also very shiny and smooth.
Black Obsidian crystal is very powerful, it grounds the soul and magnifies any negative energy so that it can be addressed. It can also increase self-control and provide support during any change.
Black Obsidian can be used to protect you against environmental pollution.
As Obsidian soaks up so much negative energy you need to cleanse the crystal after each use.