User blog comment:Icchi/Dust uses/@comment-13593058-20130805161731

Well it's already stated that Dust is energy, assuming that energy means a power source, a material made from purely Dust would be quite reactive and dangerous. We're also not sure if Yang even uses Dust as it was never stated and the possibility of her glowing for just cinematic purposes seems rather high. Another example would be when Ruby slays Beowolves and they turn to rose petals, cinematic or Dust related? The thing that's really challenging about Dust is the fact that it can be in many forms so we're never sure when something is or isn't Dust. So far we've only seen powder Dust and Crystal Dust. While it seems likely that Dust can be used as spell casts, it was never physically shown or solidly stated on any character to my knowledge, except for Weiss Shnee, that they use Dust.