Obsidian Ore
This mod is no longer supported by the developer, and some of its features are now part of the Subterranean Switcheroo project.
The modification adds a new ore called Obsidian Ore to the game, which spawns quite frequently at Y-levels 2 through 11. However, these deposits are rather small and appear in tiny clusters. If you mine this ore with a diamond pickaxe, it drops one obsidian shard. To obtain a standard obsidian block, you need to arrange four such shards on a crafting table in a square pattern.
The textures are temporary and may be updated in the future.
Note: If you have a tool with the Silk Touch enchantment, you can smelt the obsidian ore directly in a furnace to obtain an obsidian shard.