Supplementary Material Table S: Mineral Content of Samples as Determined by Optical Microscopy on Thin Sections Sample Appearance Munsell Colour Inclusion characteristics Inclusion number of thin identities section Hue Value Chroma Colour Size range Sorting Roundness Name Chemical / Shape composition 1b Orangey red 5 YR 4 6 Abundant Mostly Very Very Quartz SiO2 with black (main) red 0.1 0.5 Poor angular – Calcite CaCO3 core mm, some and sub Olivine (Mg,Fe)2SiO4 bigger 1.0 rounded 1.5 mm – (Mg,Fe)SiO3 2.5 Black Plagioclase NaAlSi3O8 –
Supplementary Material Table S: Mineral Content of Samples as Determined by Optical Microscopy on Thin Sections Sample number Appearance of thin section Munsell Colour Inclusion characteristics Inclusion identities Hue Value Chroma Colour Size range Sorting Roundness / Shape Name Chemical composition 1b Orangey red with black core 5 YR (main) 2.5 4 6 red Black Abundant Mostly 0.1 – 0.5 mm, some bigger 1.0 – 1.5 mm Very Poor Very angular and sub rounded Quartz SiO2 Calcite CaCO3 Olivine (Mg,Fe)2SiO4 (Mg,Fe)SiO3 Plagioclase NaAlSi3O8 –
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