would be my suggestion, by analogy with "whole grain" or "whole wheat," for instance. ("Whole powder" alone is rather too vague, as well as literalistic.)

Going the other way, you might say "undiluted" (which of course usually applies to liquids; there's an analogous word for solids, I'm sure, but it escapes me at the moment) or "unadulterated" (which also implies the non-addition of vitiating substances).

As for "total pulverization," see the following web site:

"...Clegg Brasil Ltda. [...] for drying, weighing, crushing, total pulverization and quality control preparation..."

The product of total pulverization appears to consist simply of (finely) ground powder, (finely) milled powder, or the learned "pulverulent" (an adjective used as a noun, analogous to "supernatant" and "vitreous" in chem and ophthalmology).

Hope this helps a little!
HC