pumice stone, similar volcanic rock
Latin word, found 36 times in the texts on Socratos.
Vergil, Georgics 4.44: pumicibusque cavis exesaeque arboris antro.
Ovid, Metamorphoses 8.562: Pumice multicavo nec levibus atria tophis
Ovid, Fasti 4.495: est specus exesi structura pumicis asper,
All forms of pumex