Note 3385 — BOOK XXXVII. THE NATURAL HISTORY OF PRECIOUS STONES. (continued 2)
John Bostock translation
“Shell-stone.” Not the same, probably, as the Cadmitis or Ostracitis mentioned in Chapter 56 of this Book. See B. xxxvi. c. 31, where a stone of this name is also mentioned. Horn-stone, probably, a Chalcedony, more brittle than flint, is meant in the present passage.