Aluminium/en

Aluminium is a metal and an element added by various mods.

Vanilla
on the Minecraft Wiki

GregTech 5
The main source of Aluminium is, but it can also be acquired from electrolyzing various other dusts as well. Aluminium Dust cannot be smelted in a regular and must be smelted in a  or an  to be smelted into ingots. Ingots and plates are mostly used as replacements for, but are required in some other recipes as well.

GregTech 6
GregTech 6 has very complicated aluminium deoxiding.

Immersive Engineering
Aluminium is created by smelting.