Note 2509 — BOOK XXXVI. THE NATURAL HISTORY OF STONES.
John Bostock translation
A variety of the modern Porphyry, possibly; a compact feldspathic base, with crystals of feldspar. Ajasson refuses to identify it with porphyry, and considers it to be the stone called Red antique, of a deep uniform red, and of a very fine grain; which also was a production of Egypt.