Carchedonia,[1] too, is said to have the same property, though far inferior in value to the stones already mentioned. It is found in the mountains among the Nasamones,[2] being produced, the natives think, by showers sent for the purpose from heaven. These stones are found by the light of the moon, more particularly when at full: in former days, Carthage was the entrepô for them. Archelaüs speaks of a brittle variety being found in the vicinity of Thebes also, in Egypt, full of veins, and similar to dying embers in appearance. I find it stated, too, that in former times, drinking-vessels used to be made of this stone and of lychnis:[3] all these kinds of stone, however, offer the most obstinate resistance to the graver, and, if used for seals, are apt to bring away a part of the wax.