It wouldn’t surprise me if they are on the opposite side of “lol German words are compounded like crazy” and look at us as “lol English has a different word for everything now get me a drink from the cool closet before I put you in the sick house, you shield toad.”
according to the Swedish dictionary, a "stuff" is a drill core, or other piece of rock that's used in lab tests.
so "kalkstuff" is a piece of limestone. google translate has no clue in this case.