Table 5. Comparison of the mean elemental weight fractions obtained using XRD and calibrated WD-XRF weight fractions for five pyrite concentrate samples from the same aliquot, each individually ball milled for 7 min.

WD-XRF data were empirically calibrated using standard mixtures to correct for matrix effects (Rousseau, 2006 ▸). Sample standard deviations of the mean values from the five repeats are indicated.

	Wt%
Element	XRD	WD-XRF
S	45.4 (2)	47.2 (2)
Fe	40.3 (2)	42.04 (14)
Si	5.00 (11)	4.03 (10)