Silex is a collection of unglazed porcelain tile from the Spanish factory Alcalagres. “Silex” means "flint" in English, which is a sedimentary rock mineral. The individuality of the pattern of this type of quartz made it really attractive for the interior decorations. Original colors of the material, smooth transitions between color shades have been evolving over many thousands of years. Silex Alcalagres slate effect porcelain tile is presented four natural tones . Arena and Gris tones are noted for their expressed pure naturalness. Tabaco is endowed with warm natural color which adds coziness to the design. And last, Grafito, imitates a special variety of the mineral – the black flint.