As confirmed by Karune during the 4th Q&A released on the battle.net forums :
1)Are the yellow minerals shown in the trailers harvestable?
Yes, they will be a harvestable
high yield resource, meaning each harvest rotation will result in
greater mineral quantities than the standard blue minerals. This gives players more strategic choices when trying to evaluate where they wish to expand. Expand to the high yield but risk easier discovery? Or expand to a safer area but earn fewer resources?
Here's to Red Crystals in the expansion.
