Quarries of pink Porriño granite Curiosity · O Porriño, Vigo, Pontevedra In the parish of Atios is concentrated one of the largest groupings of quarries in Europe, with a capacity of hundreds of thousands of tonnes a year of the so-called rosa Porriño, a granite of pink microcline that clads buildings on five continents; stonecutting is here both trade and industry and explains the strength of the stone sector across the whole comarca. Photo: Adrián Estévez (User:Estevoaei) (CC BY-SA 4.0) What to see and do in O Porriño