Aluminum

Aluminum is a material added by XyCraft and Tinkers' Construct, not to be confused with Aluminium.

XyCraft
Aluminum is used only in the creation of Aluminum Cans.

Tinkers' Construct
Although it cannot be used to make tools, Aluminum is used to make Aluminum Brass, Alumite and Red Metal. It's also can be used as a component for making Tool Forges and many other items, like the Empty Canister.

Aluminum vs. Aluminium
Aluminum is not the same as Aluminium, added by the GregTech mods. They cannot be converted in a Forge Lexicon, and they are not compatible in the Ore Dictionary. Calling it Aluminum instead of Aluminium was a design choice by Soaryn, the author of XyCraft.