NERO PORTORO Italian marble | Marble Guide
https://marbleguide.com/marble/portoro-italian-marble/
Nero Portoro is a black marble from Italy (Porto Venere,La Spezia, Riviera, Liguria). Forms: Slabs, Blocks, Tiles. ... Also known as: Black Portoro, Portoto Nero Giallo, Portoro Nero, Portoro Macchia Larga, Nero Portoro Vena Larga, Nero Portoro Macchia Larga, ...