Obsidian

Obsidian is a unique pre-Hardmode Ore which is created when Water and Lava collide, at which point it forms placed Blocks that can be mined and collected. Obsidian appears as an Ore and is gathered similarly, but has no bar form of its own; though it is required in order to craft Hellstone Bars. Mining Obsidian requires a pickaxe with at least 65% pickaxe power or Explosives.

Tips

 * A good way to rapidly acquire obsidian with little effort is to put in contact a large pocket of water with a large pocket of Lava, by digging a small conduct in the water pocket leading to the bottom of the lava pocket. Then, one can safely collect obsidian in a way lava falling on water will produce an obsidian block at the exact spot of the block that has just been collected.

Trivia

 * Obsidian in real life is cooled volcanic glass. It is a very brittle substance that chips easily.

History
Obsidienne 흑요석 Обсидиан