Dusts

Dusts (also called Pulverized material and Grit) are a material form originating from IndustrialCraft 2. They are commonly used to create Ingots, and sometimes used as components.

Smashed Ores
Flaxbeard's Steam Power adds its own dusts known as Smashed Ores. They can be smelted into their according Ingot form.

They can be produced by smashing Ores in the Rock Smasher, which has a configurable chance to drop multiple smashed ores per ore block.

Smashed Ores can also come from the Poor Ores from Railcraft, which are produced in the Rock Smasher as well.