The Negro Marquina is a black coloured marble, with fine grain and occasional areas with white veinage and fossils remains. It presents a very dark black coloured and uniform background. Its main variations depend on the intensity of the black colour, abundance of white veinage and white fossils.
In terms of hardness, the Negro Marquina is considered a hard natural stone. 
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The Negro Marquina marble is explored around the area of Marquina-Jemein, which is located in the Vizacaya province, region of Pais Vasco (Basque Country in English). Marquina-Jemein is located at about 50 kilometers east of Bilbao and at about 420 kilometers northeast of the Spanish capital Madrid.
Marquina-Jemein is located just few kilometers south of the coast and is part of the Basque Mountain Range (Montes Vascos in Spanish).