In caves. They are formed when water pours over a source block of lava. If it isn't a source block, then it will be turned into cobblestone. Plus there is sometimes lava under obsidian.
Chat with our AI personalities
Obsidian is created whenever water flows on top of still lava.
No. Only a Diamond Pickaxe can mine obsidian.
You need a Diamond pickaxe to mine Obsidian.
In the latest Minecraft, you can.
You need a Diamond Pick to harvest obsidian blocks.