you cant
you mine obsidian with diamond pickaxes
4 cobble stone in a t shape and then 4 gold blocks around the t then put the nether reactor on the middle cobble stone then cobble stone in a t shape around the nether reactor so the nether reactor is in the middle then a bother cobble stone t on top of that then hit the nether reactor if you need more help type in nether reactor on mine craft wiki and you will find out how to.
You need to build the nether core. Here is what you need:4 gold blocks12 cobblestone blocks1 nether core reactorA sword to kill pigmenThe nether core is just a box of Obsidian or Netherrack were you can get the most of the items you can get like glowstone dust, gold ingot, iron ingot, and, for some reason, cactus.
You can't craft them, you have to mine them from Nether Fortresses.
You build a portal out of 14 obsidian
Umm, if you mean nether bricks then you will have to use a nether reactor. While using it you will be encased in netherrack which you can mine then smelt to turn in to nether brick items, then craft them like normal bricks. If you have recently used it then just mine the netherrack. If you have used it prior to 0.6.0, then it makes obsidian not netherrack and you will have to use it again
If you are not sure, go to the minecraft wiki and type in nether reactor on the search bar. Craft 3 diamonds +6 silver ingots= nether reactor core. Craft 4 gold blocks Then go mine about 20 stone blocks(this will give you cobblestone) The format for building is on the wiki, and so is all the information you need. Once you go into the neather, the 17*17*17 obsidian room will spawn several items including more gold ingots. Bring food, tools, and a crafting table because there will be Zombie Pigmen there. You can only stay there for a limited time. Under 2 minutes. I hope this answered your question.
you cant only on computer or xbox.
its called the nether but its on the pc and xbox version too
ghast look like full grown slimes but with tentecals underneath and can fly in the nether they shoot firecharges at you too. < only in nether unless spawned>
Mine Nether Quartz, then on your character's own crafting slot, put a piece of Nether Quartz in each, to craft them into one Quartz Block.
you go to the nether and mine some then you place it down.