specular stone noun2 •Any transparent or translucent stone.They were furnished with wooden sashes in which were placed transparent or specular stones. These were of various kinds: — 1845 •(historical) A type of transparent stone (lapides speculares) that was used in classical times for glazing, adding sparkle to floor coverings, etc. Various modern authors have identified this stone as selenite, talc, or mica.Specular Stones were a shining kind of Substance, and (according to Basil ) transparent like the Air. — 1715 formsspecular stones
