Figure 42

SEM images of calcium phosphide crystals in vesicles of mudbrick meltglass from the palace. (a) and (c) Crystals of calcium phosphide, Ca₃P₂, lining the inside wall of meltglass vesicles; (b) and (d) manually constructed EDS-based phase map of Ca₃P₂ (green) crystals embedded in typical Ca–Al–Si melted matrix.