The crystallization behavior of 10 binary glasses belonging to the CaO-MgO-Al2O3-SiO2 quaternary system and two glasses corresponding to anorthite and diopside composition was investigated by X-ray diffraction, thermal, and thermomechanical analyses, and scanning electron microscopy. Particular emphasis is laid on the quantitative X-ray diffraction analysis by the Rietveld-reference intensity ratio combined procedure, which seems to be a useful tool to obtain time-temperature-transformation diagrams. Results showed that to obtain glass-ceramics with a significant crystalline phase presence, it is necessary to treat samples at 1000 degrees C for 4 h or at 1100 degrees C for 1 h.