With increasing the firing temperature the intensity, of the crystallization peaks decreased until the main phase became. Glass at 1280 C. Due to the very few content of loveringite, in glazes it had little influence on the opacity and strength. Of the glaze surfaces. As a result the presence, of whitlockite and quartz were only considered. Fig. 4 shows the STEM / EDS. Elemental analysis of the etched glazes surface at different firing temperatures. Due to the acid treatment some aggregate,, Crystals were observed on the glaze surface at 1160 C while they, diffused at 1220 C and finally disappeared at 1280, C. Moreover strong Ca, and P signals were detected from the aggregate crystals indicating that, these crystals might be whitlockite. Rather than quartz.
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