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Obsidian in a cave, formed by water flowing over a lava pool.

 Obsidian is created when a source block of lava is contacted by a flowing or source water block. Obsidian is not hard to come by, However, it is difficult to harvest; The block takes time to break and you need Diamond Pickaxe (or greater) to do so.

It can also be obtained when the Kreknorite Meteor from the Falling Meteors Mod begins to cool. Kreknorite blocks will cool into Obsidian, and this results in Obsidian being readily available on the Overworld surface.

Obsidian is a Material in the Tinkers' Construct mod. It can be smelted at the Smeltery to produce Molten Obsidian which can create Obsidian Ingots for weapons and tools. Doing this may also produce Obsidian Chunks, which can then be used to produce other Obsidian parts or repair broken Obsidian tools. Pouring Molten Obsidian into a Casting Basin will result in a normal Obsidian block instead of a block of ore (such as Copper, Iron, Brass, etc.).


An example of a Nether Portal, made by an Obsidian frame and Flint and Steel.

Obsidian is used in the crafting of Obsidian Brick, Altar of Light, Altar of Souls, Soul Crucible, Skybeam Block, Ender Shield, Ender Giant Sword, Industrial Blast Wall, Industrial Glass Wall, Storage Capsule Station, Scale Armor, and Obsidian Pressure Plate. It can also be smelted in a Smeltery for 288mB of molten obsidian. Obsidian is used in the creation of Nether Portals. Make a frame of Obsidian leaving a 2 block wide, 3 block high space in the middle, then light the bottom blocks with Flint and Steel.

Vanilla Blocks
Natural Air.png AirBedrock.png BedrockClay (Block).png ClayCobblestone.png Cobblestone (16px Moss) •16px CobwebDirt.png Dirt16px End PortalFire.png Fire16px Grass Block (16px Mycelium) • 16px GravelIce.png Ice16px Monster Egg16px Monster Spawner16px Sand16px Sandstone (16px Smooth16px Chiseled) • Obsidian.png Obsidian16px SnowStone.png Stone16px Stone Bricks (16px Cracked16px Mossy16px Chiseled)
Manufactured 16px Bookshelf16px Bricks16px Cobblestone Wall (16px Mossy) • 16px FenceFlower Pot.png Flower PotGlass.png Glass (Glass Pane.png Pane) • 16px Iron Bars16px Jack o'LanternLadder.png Ladder16px Slabs16px Snow16px Stairs16px Wood PlanksWool.png Wool
Ore 16px Coal Ore16px Diamond Ore16px Emerald Ore16px Gold Ore16px Iron Ore16px Lapis Lazuli Ore16px Nether Quartz Ore16px Redstone Ore
Mineral blocks 16px Block of Diamond16px Block of Emerald16px Block of Gold16px Block of Iron16px Block of Quartz (16px ChiseledPillar Quartz Block.png Pillar)
Utility 16px Anvil16px BeaconBed.png BedBrewing Stand.png Brewing StandCake.png CakeCauldron.png CauldronVanilla - Chest.png Chest (16px Ender) • 16px Crafting TableEnchantment Table.png Enchantment Table16px Farmland16px Furnace16px JukeboxSign.png Sign16px TNTTorch ig.png TorchWither Skeleton Skull.png Wither Skeleton Skull
Mechanisms 16px ButtonCommand Block.png Command BlockDispenser.png DispenserDaylight Sensor.png Daylight Sensor16px Door16px DropperFence Gate.png Fence GateHopper.png Hopper16px Lever16px Note Block16px Piston16px Pressure Plate (16px Weighted)
Plants 16px Cactus16px Carrots16px Cocoa16px Dead Bush16px FlowersGrass.png Grass (16px Fern16px Shrub) • 16px Leaves16px Lily PadMelon (Item).png Melon16px MushroomsPotato.png Potato16px Pumpkin16px SaplingSugar Canes.png Sugar Canes16px VinesWheat.png Wheat
Liquids 16px LavaWater.png Water
The Nether 16px GlowstoneNetherrack.png Netherrack16px Nether Brick (16px Fence) • Nether Wart.png Nether Wart16px Soul Sand
The End 16px Dragon Egg16px End Stone
Creative Only Sponge.png Sponge
Technical 16px Active Redstone Repeater16px Piston Moving16px Burning Furnace16px End Portal16px Flowing Lava16px Flowing Water16px Glowing Redstone Ore16px Off-state Redstone Torch16px On-state Redstone Lamp16px Piston Arm16px Nether Portal