Fig. 11: Microstructure in the glaze layer of the sample.

a SEM photograph of the un-reacted quartz grains in YJ17 (red cross symbol: the detection point), b point scan spectrum of grains (spectrum 1 in a), c SEM photograph of the anorthite in YJ1 (red cross symbol: the detection point), and d point scan spectrum of grains (spectrum 2 in c).