Uranium

A radioactive material often found in deposits in planets, especially ones near stars. Useful for energy generation from reactors or radiation generators. It is a spawnable non-flammable solid.
Here is a list of possible sizes that reach the maximum malleability (3) that have integer components: 1x1x3
At its default size (1x2x1) it has a durability of 10, at its maximum size it has a durability of 12.
By default, its colour is #2ba123.