“…Thanks to this complex geological setting, this area is very rich in stone deposits, particularly exploited in ancient times for different purposes, such as in architecture, statuary, tool production and jewellery. Marbles, sandstone, granite and granodiorite were the most common and their deposits were intensively exploited (Harrell and Storemyr 2009), as also were gneiss (Neumayr et al 1997;Fowler et al 2007;Ali et al 2011), gabbro (Siddal 2013), steatite (Harrell et al 2000;Harrell and Brown 2008) and gemstones, among them amethyst (Shaw and Jameson 1993). Mining activities were particularly intense also for the extraction of metals, like copper and iron, found for example in the mines of the Wadi Abu Gerida area (Abd El-Rahman et al 2013).…”