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home Company Projects The quarries News Contacts Shop Newsletter Sign up for our newsletter Come back Portoro Ancient Vein Geologically it is a limestone with limonite carbonate veins formed in a calm, deep, poorly oxygenated marine environment rich in organic matter. The black color is due to the richness of organic substance while the golden streaks to the partial dolomitization of the organic substance that has oxidized. In addition to color, the microcrystalline structure due to dynamometamorphic processes also contributes to the quality of this variety of marble that can be classified among the compact, crystalline saccharoidal ones. Portoro or Portovenere marble is a precious variety of black marble from the La Spezia area. Its very decorative aspect makes it suitable for artistic and valuable creations such as vases, columns, interiors of churches and palaces, coverings, floors and furniture tops. The color is intense and brilliant black with golden veins. The best finishes are polishing and antiquing. Color : black with gold vein Availability : medium Petrographic : microcrystalline limestone Commercial : Portoro marble Demetra ha effettuato le opportune ricerche per assicurare l'accuratezza delle informazioni contenute in questo sito web. Tale informazione è tuttavia esclusivamente fornita per scopi di riferimento e Demetra non rilascia alcuna dichiarazione o garanzia di qualsiasi natura per quanto riguarda l'esattezza e la completezza di tali informazioni. Demetra quindi, in nessun caso, può essere ritenuta responsabile per qualsiasi danno o incidente subito in conseguenza, diretta o indiretta, dell'uso delle informazioni qui fornite. Cave esclusive Sainte Croix de Mareuil Cava Kesra Cava Taza Cava Parodi Marmi della Gherardesca Cava Fleuran Cava Beola Favalle Vedi tutte Progetti Bagni Le Royal Monceau Ristorante a Firenze Volterra 02 Ristorante A Firenze Fontana del Nettuno (bian... Marmi L.E.A. Maculati Piastrelle rustiche Vedi tutti ITALY DEMETRA SRL Via Martyrs of Kefalonia s / n 54100 Massa (MS) Tel. 0585,504,654 - Fax. 0585,856,513 info@demetraitalia.com General conditions Privacy Newsletter Partners Company data