Also known as / varieties Gobertange stone, Bruxellian stone, Calcaire gréseux de Gobertange Extraction zone Region of Jodoigne, province of Walloon Brabant Mineralogical composition Calcite 73-87 %, quartz 11-25 %, traces of ferruginous minerals Maximum dimensions of rough blocks Length 0,7 m width 0,4 m thickness 0,12 m Minimum thickness for application 6 cm Surface treatment Split, chiseled, aged, sawn, grinded, honed, easy cutting and moulding Common applications Outside : rubble stone, dressed stone, window and door sill, floor tile, paving stone