Portoro Buono From Wikipedia, the free encyclopedia Italian decorative limestone Jurassic limestone Nero Portoro, variety ″macchia fine″ Porto Buono or Nero Portoro is a decorative stone from Porto Venere, near Spezia, Liguria, Italy. It is a Jurassic golden or white veined black Limestone.[1][2] List of stone References ↑ ETH Zurich: Nero Portoro. www.materialarchiv.ch (German) ↑ DNSA: Portoro Nero Giallo. www.natursteinonline.de (German) This article related to petrology is a stub. You can help Wikipedia by expanding it.vte Related Articles