Note 3250 — BOOK XXXVII. THE NATURAL HISTORY OF PRECIOUS STONES. (continued 2)
John Bostock translation
“Hair-stone.” This was probably either Iron alum, known also as Alun de plume; Alunogen, known also as Feather Alum or hair salt; or Amianthus, also called satin Asbestus. See B. xxxvi. c. 31.