User blog comment:Sorairo/On the Topic of Dust: Explanation?/@comment-23784953-20130813085449/@comment-4773581-20130814042335

The opening narration implies that they came from Dust (A) and named the power crystals that they found Dust (B) as a homage to what they came from, Dust (A).

Dust (A) is a mysterious thing of unknown everything that is the source of their creation, or at least the mythos behind it, and Dust (B) is a natural resource they discovered and named after it, for whatever reason they had at the time.