Raman measurements were carried out using a micro-Raman spectrometer (inVia, Renishaw). The sample surface was excited by a 532 nm green diode pumped solid state laser for an acquisition time of 10 s. First, we prepared pristine glass samples in a closed crucible immediately followed by Raman spectroscopy measurements. Next, we performed the measurement during the entire glass formation process of two samples (pristine and hydrated glass) by adding crystal (~5 mg)