Analysis of geological materials requires the use of matrix specific reference materials (RMs). Phosphate rocks (PR), the
basic ingredient of phosphate fertilizers, are very important in agriculture. A project was undertaken to study the PRs of
the Hazara Deposits of Pakistan. Due to the unavailability of phosphate rock reference materials (PR-RMs) with a large number
of certified elements, validation of the results was problematic when carrying out elemental analysis of PR samples and their
derived products. Therefore a parallel study was performed to determine the composition of three phosphate based RMs; BCR-RM-032
(Natural Moroccan Phosphorite), IAEA-434 (Phosphogypsum) and PRH (a local PR-RM from the Hazara Deposits of Pakistan). Instrumental
Neutron Activation Analysis was used for this purpose and more than 30 elements including rare earth elements were determined
in the three PR samples.