The thermal behaviour of an uvite from San Piero in Campo (Elba Island, Italy) was investigated at room pressure through in-situ High-Temperature X-Ray Powder Diffraction (HT-XRPD), until the breakdown conditions were reached. The variation of uvite structural parameters (unit-cell parameters and mean bond distances) was monitored together with site occupancies and we observed the thermally-induced Fe oxidation process counterbalanced by (OH)− deprotonation, which starts at 450°C and is completed at 650°C. The uvite breakdown reaction occurs between 800 and 900°C. The breakdown products were identified at room temperature by X-Ray Powder Diffraction (XRPD) and the breakdown reaction can be described by the following reaction: tourmaline → indialite + yuanfuliite + plagioclase + “boron-mullite” phase + hematite.
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