You make Glowstone Blocks with 4x Glowstone Dust in a square formation, on your crafting grid.
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You get Glowstone Dust from breaking blocks of Glowstone, you get 2-4 from each block.
Go to the Nether, and break glowstone, it looks yellow and glows brightly, and glowstone dust will fall. Pick up the dust and put it in a 2x2 formation in your crafting table. This will give you glowstone blocks. Also, if you have a silk touch enchanted pickaxe, you may break the blocks and have them built automatically.
Glowstone is crafted by 4 glowstone (as shown in the screenshot) lined into a 2x2 box in the bottom left of the crafting table interface.
Its called a redstone lamp. It is crafted with a glowstone in the middle and four pieces of redstone around it.
First, you must install the Aether mod (which is huge, by the way.) Then, in order to make an aether portal, you must have at least 14 glowstone blocks. Build it like this: XXXX XooX XooX XooX XXXX X = Glowstone o = Air When you're done, pour water in the interior of the glowstone. This will make a portal to Aether.