Those in white marble come from Italy , some shafts located in the area of the mihrab are in red porphyry imported from Egypt .
Those made of greenish or pink marble are from quarries of Chemtou .
Those in white marble come from Italy , some shafts located in the area of the mihrab are in red porphyry imported from Egypt , while those made of greenish or pink marble are from quarries of Chemtou .