Most people never pause to think about what is actually holding their everyday items together. That plastic product may contain a mineral you have never thought about, and the difference is not just in the powder itself. Calcium carbonate has to match the grade, particle size and exact purpose of what is being made, otherwise it does nothing useful. The same mineral that stiffens one product can refine the surface of another or simply help keep costs sensible without compromising quality. It is the kind of quiet, precise work that rarely gets noticed until someone explains it properly, and that is what you have done here. Well said, Queen Keenny. The details matter more than most people realise.