Noir de Mazy is the only Belgian black limestone that is still exploited today. It is named after the quarry in the Belgian town of Mazy near Gembloux in Wallonia. It is also marketed under the name ‘Noir de Golzinne’, this refers to the geological vein that is exploited in Mazy. Originally worked on open ground, the quarry is operated since beginning of XXth century in mines with a rooms and pillars method. The stone is quarried at an average depth of 75 meters underground. Very specific equipment is required for the exploration. Annual production of the quarry does not exceed 500 cubic meters. These plinths have been salvaged in an office building of the 1950’s on the Solvay campus in Ixelles.