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I just googled it and apparently these are often chipped of historical buildings and sold as tourist souvenirs. Thanks for informing us

Indeed, it's sad. They are staple here in Portugal, covering entire buildings. Beautiful examples: https://maps.app.goo.gl/3BK1BoMVsgRY38eG8 and https://maps.app.goo.gl/fquP923g13xtbSxU8