Dusts

The SEM adds for every Ingot a Dust, which you can produce by putting an Ore or Ignot in the Steam Mill. Most of the Dusts can process into Ignots by using an Furnace.

By grinding an Ore Block you get 2 Dust, so this is useful for dupicating your Ores.

The Obsidian Dust is special. You can produce it by grinding Obsidian, but it is impossible to burn it back into Obsidian. You need this Dust for the Magic Fall Marble.