The Aluminum Block is a block that is a bulk storage for your Aluminum Ingot.
It can also be used as an attractive and unusual metallic looking decorative block.
Compatibility with other mods
If you have another mod installed with a different variety of aluminum, normally you can mix and match the ingots to craft an Aluminum Block.
In Galacticraft 3 and Galacticraft 4: If you have another mod with a different type of Aluminum Ingot, a Galacticraft Aluminum Block will be made from mixed aluminum ingots so long as you use at least 1 Galacticraft Aluminum Ingot in the recipe. If you use zero Galacticraft ingots then a Galacticraft block will not be made. This requirement for minimum 1 Galacticraft ingot in the Galacticraft recipe allows you to control whether it is the Aluminum Block from Galacticraft which is made or the aluminum block from the other mod.