Fig. 4

Raman spectrum of crystals in the glaze of cross section samples: blue line for dendritic crystals in light greenish blue glaze and purple line for columnar crystals in reddish purple glaze. Analyzed one point by one point, wollastonite were the main crystals observed in the glaze, nevertheless other crystalline phases like pseudowollastonite, diopside and plagioclase were not detected