2510.20.00.00 - Ground

This HTS classification, 2510.20.00.00, specifically covers natural calcium phosphates and natural aluminum calcium phosphates that have undergone a grinding process. This category encompasses materials such as phosphate rock that has been pulverized or reduced to powder form, making it suitable for direct use in applications like fertilizer production or as an ingredient in animal feed. The key characteristic for inclusion here is the physical state of being "ground."

It is crucial to distinguish this classification from its sibling category, 2510.10.00.00, which pertains to the "unground" forms of the same natural calcium and aluminum calcium phosphates. The fundamental difference lies in the processing; 2510.10.00.00 covers these phosphatic minerals in their natural, uncrushed or unpulverized state, whereas 2510.20.00.00 applies to those that have been subjected to mechanical grinding or milling.

As this is a leaf node within the HTS structure, there are no further subdivisions. Therefore, classification within 2510.20.00.00 is determined solely by the material being a natural calcium or aluminum calcium phosphate and its condition of being ground. Any natural phosphatic chalk that has also been ground would fall under this heading.