Portoro, the black and gold Italian “marble”

@article{Fratini2015PortoroTB,
  title={Portoro, the black and gold Italian “marble”},
  author={Fabio Fratini and Elena Pecchioni and Emma Cantisani and Fabrizio Antonelli and M. Giamello and Marco Lezzerini and Robert Canova},
  journal={Rendiconti Lincei},
  year={2015},
  volume={26},
  pages={415-423}
}
AbstractPortoro is one of the most famous Italian black limestones due to its characteristic golden-yellow veins on a black background. It was used since Roman times, mainly in the city of Luni. Since the Middle Ages, its use is widespread in Genoa, and from the XVII century, it became one of the most common stones in religious buildings throughout Italy. At the end of the XIX century, its use has spread abroad, particularly in Europe and USA. It was extracted in several quarrying areas… 
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