Fig. 3
From: Beautiful Pietàs in South Tyrol (Northern Italy): local or imported works of art?
Aggregate of pyrometamorphic and hydration reaction products comprising calcite, high magnesian calcite, hydrated magnesium sulphate phases (hexahydrite), anhydrite and gypsum in the binder matrix of the sample originating from the Pietà in the Abbey Church Marienberg: a transmitted light, crossed/parallel Nicols, and b Raman microspectroscopic map of the area highlighted in Fig. a showing phase distributions in false colours based on the intensities of marker bands. White areas are due to co-localisation along the optical axis of (high magnesian) calcite and hexahydrite