Marble analysis, 50.1722
Gypsum has been used in Egypt for thousands of years. Deposits are known near Alexandria and Port Saïd, along the Suez Golf cost, in the Fayoum area, at Qoseir and north of Ourghada on the Red Sea. Thus, a local source close by its discovery site is most probable.
D. Decrouez & K. Ramseyer (1998)
50.1722; Sarapis head from Egypt