The utilization of industrial waste as an aluminosilicate precursor (AP) for alkali-activated material (AAM) production can provide an outlet for the growing waste stream and relief to landfill. However, to achieve the transformation of extremely varied waste into normalized APs with stable performance on an industrial scale, a universal testing method and criteria for quantifying the geopolymerization reactivity (GR) of APs are crucial. To facilitate the establishment of a more consistent method for determining the GR of APs, this paper reviewed and compared four mainstream methods for GR quantification: quantitative X-ray diffraction (QXRD)–based methods, energy-dispersive X-ray spectroscopy (EDS)–based methods, selective dissolution, and leaching tests. QXRD-based and EDS-based methods, as conventional and robust methods for material characterization, have gained excellent agreement with each other on the determination of inherent amorphous phases of APs, which have been proven