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It's like carving glass -this stone must be abraded not carved. Once polished though - there is no stunning black like it!
Obsidian can be used to make extremely sharp knives, and obsidian blades are a type of glass knife made using naturally occurring obsidian instead of manufactured glass. In fact it was used even to carve stone. It is said that Obsidian blades were used to make the Easter Island Heads...
Please use diamond tools and respiratory protection.