Pietra del Cardoso or Cardoso stone is a sandstone extracted in the Versilia region in the Apuan Alps. This stone is characterised by the dark grey background, similar to ashes with some white soft veins. Pietra del Cardoso is an ancient limestone, with a very neutral and homogeneous background that suits many settings and can be combined with other stones. It is widely used for outdoor applications, for squares, external floorings, claddings, sidewalks,..