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XRD diffractograms of foam glasses sintered at a) 750 °C, b) 800 °C, c) 850 °C, and d) 900 °C, 1- Diopside (CaMgSi2O6) 2- Wollastonite (CaSiO3), 3- Merwinite (Ca3Mg(SiO4)2).