Is it natural to make a natural stone for grinding machines? Is there anything wrong with the food out of the mill?
At present, the natural stone used in the decoration project has radioactivity testing standards, but it may not be tested on the grinding stone.
Even if radioactive, hazardous objects are also exposed to stone, radioactivity will not be transferred to the abrasive object.
The hazards of natural stones come from radioactivity. If it's not radioactive, it's harmless to humans.