Obsidian is created when Water makes contact with a Lava Source. Obsidian can only normally be mined with a Diamond Pickaxe, however, other mods may have Pickaxes also capable of doing so.

Industrial Craft 2

The blast resistance of Obsidian was changed from 6,000 to 60, which means that both Nukes and Nuclear Reactors are capable of destroying Obsidian within their blast radius'.


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