Note 3093 — BOOK XXXVII. THE NATURAL HISTORY OF PRECIOUS STONES.

Dalechamps thinks that this is the same as the “anthracites” mentioned in B. xxxvi. c. 38, and identifies it either with our Anthracite, or else with pit-coal or bituminous coal. It is much more likely, however, that a precious stone is meant; and, in conformity with this opinion, Brotero and Ajasson have identified it with the Spinelle or scarlet Ruby, and the Balas or rose-red ruby, magnesiates of alumina.