40-60-80-100-200 micronized calcium carbonate (granulometry between 0 and 200 microns) generated from semi-crystalline limestone of high whiteness and purity extracted from an Italian quarry of primary quality; it is used in numerous chemical and industrial processes, in construction, in agriculture, as a supplement to feed, etc. and in all those uses in which only an insignificant content of heavy metals is tolerated.