These systems produce the calcium aluminosilicate (CAS) glasses. "The glass-forming region for calcium aluminosilicate glasses has been determined" by . However, "the formation mechanism and crystallization process of glass phases are still unclear" . In their work, "the glass phase and the crystallized samples of the CaO-SiO2-Al2O3 system were characterized using X-ray diffraction, optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy and Raman spectroscopy. … The results showed that the chemical composition significantly influences the crystallization of the CaO-SiO2-Al2O3 glass" . Decreasing the basicity and the mass ratio of CaO and SiO2, is favoring the crystallization of the glass phase; increasing the content of Al2O3 is inhibiting the crystallization of the glass phase . Actually, "among the materials available, CaO-Al2O3-SiO2 (CAS) is a predominant ternary glass-ceramic system" with great potential applications , and references therein).