Serizzo Formazza, Serizzo Antigorio, Gneiss Blocks, Gneiss Slabs
Grey - Gneiss
Ortogneiss granitoid with a homogeneous coarser grain than the serizzo Antigorio and Sempione and slightly lighter color. Very evident foliation. Mineralogical composition: quartz, potassium feldspar in small porfiroclasts, plagioclase (An 25-30%), biotite, muscovite. Extraction area "Bort" quarry - Municipality of Formazza (VB)
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