*2.2. Experimental Methods*

2.2.1. Chemical and Mineralogical Properties

The phase composition of the measured mixtures was studied by X-ray diffraction (XRD). Diffractograms were recorded using a Malvern PANalytical Aeris diffractometer equipped with a CoKα source operating at 7.5 mA and 40 kV. The incident beam'd path consisted of iron beta-filter, Soller slits at 0.04 rad and a divergence slit at 1/2◦.

For measurement by XRF analysis, a sequential WD-XRF spectrometer (ARL 9400 XP, Thermo ARL) was used, which was equipped with a Rh anode tipped X-ray tube (type 4 GN) fitted with a 50 μm Be window.
