Note 661 — BOOK XXXIII. THE NATURAL HISTORY OF METALS.647

“Murrhina” or “myrrhina.” are described in B. xxxvii. c. 8; they were, perhaps, onyxes or opals, though possibly the term was not strictly confined to these substances, but signified any transparent minerals, that exhibited a variety of colours. Salmasius, however, ridicules the idea of their being onyxes, and is of opinion that these vessels were made of porcelain; Exer. Plin. p. 144.—B.