During the reign of Nero, there was a stone found in Cappadocia, as hard as marble, white, and transparent even in those parts where red veins were to be seen upon it; a property which has obtained for it the name of “phengites.”2771 It was with this stone2772 that Nero rebuilt the Temple of Fortune, surnamed Seia,2773 originally consecrated by King Servius, enclosing it within the precincts of his Golden Palace.2774 Hence it was that, even when the doors were closed, there was light in the interior during the day; not transmitted from without, as would be the case through a medium of specular-stone, but having all the appearance of being enclosed within2775 the building.

In Arabia, too, according to Juba, there is a stone, transparent like glass, which is used for the same purposes as specular-stone.