User blog comment:Phantomlink959/V3C4 preview/@comment-5426254-20151126034020/@comment-4010415-20151126071512

Those were not snowballs or wind. The geyser biome has Dust crystals in it. I assume they're steam Dust, considering Miles mentioned the existence of steam Dust during Extra Life. It would make perfect sense for a geyser biome to have steam Dust in it.