Fig. 14From: Petrographic and geochemical analyses to characterise the source of built historical natural stones — a case study of the volcanic stones from historical quarries and Baoguosi Temple in the city of Ningbo, ChinaMicrophotographs of a thin section taken from the heavily deteriorated greenish/grey stone from Xujiahui Cathedral Shanghai under polarised light microscope. Left: taken with singular. Right: with crossed Nicols (Source: the authors)Back to article page