Note 305 — COLOURED GLASS.—ARTIFICIAL GEMS.
William Johnston translation
Lib. xxxv. c. 26. and lib. xxxvii. c. 9. The lapis obsidianus, which Obsidius first found in Ethiopia, and made known, is undoubtedly the same as that vulcanic glass which is sometimes called Icelandic agate, pumex vitreus, and by the Spaniards, who brought it from America and California, named galinace.