Note 2998 — BOOK XXXVII. THE NATURAL HISTORY OF PRECIOUS STONES.
John Bostock translation
Ajasson suggests that this may have been Dichroite, or Cordierite, known also as Iolite, or Water sapphire.
John Bostock translation
Ajasson suggests that this may have been Dichroite, or Cordierite, known also as Iolite, or Water sapphire.