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Igneous rock (granite). Colour: dark red, scattered of light grey spots. Minerals: quartz, potash feldspar and plagioclase. Decay morphologies: scaling. Geology: “Serie del Canavese” (Permian-Triassic) including red and grey granites barren of micas. Quarry: few kilometres west of Valperga (Cuorgnè, Canavese, Torino province). Use: mainly polished slabs for façade cladding of residential and public buildings (Palazzo INA, portals and cladding in the porch, P. Portaluppi, 1936, Milan; Palazzo del Popolo d’Italia, balcony, G. Muzio 1938/42, Milan).