Board Thread:General Discussion/@comment-68.49.230.229-20141101071806/@comment-25399914-20141102133748

Given that fossil fuels are dead things it's possible.

In the World of Remnant episode on dust it states there are only 4 types of raw dust everything else is a blend. It could be that rather then being dependant on aura it's more like fossil fuels (coal, gas, oil) it's development is dependant on how it is formed.