| Summary: | Serpentinized peridotite samples—considered nowadays as deposited waste at the magnesite mine of Gerakini (Chalkidiki, N. Greece)—were collected, and their chemical and mineralogical characterization analyzed with Energy-Dispersive X-ray Fluorescence (ED-XRF) and X-ray Diffractometry (XRD). Dry magnetic separation was used as a convenient enrichment method; however, no significant effect was shown in the chemical composition of separated (magnetic and non-magnetic) fractions, except for small increases in the olivine, antigorite and enstatite contents, which were observed in the non-magnetic fraction. Finally, the calcination of ground peridotites at 1520 °C, with the addition of CaO, Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub>, presented a negative effect on the structure of the products with regard to their main refractory properties. In contrast, the addition of Cr<sub>2</sub>O<sub>3</sub> and ΜgO mineral oxides showed improved refractory properties when compared with the initial material.
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