In no country are the molar stones2691 superior to those of Italy; stones, be it remembered, and not fragments of rock: there are some provinces, too, where they are not to be found at all. Some stones of this class are softer than others, and admit of being smoothed with the whetstone, so as to present all the appearance, at a distance, of ophites.2692 There is no stone of a more durable nature than this; for in general, stone, like wood, suffers from the action, more or less, of rain, heat, and cold. Some kinds, again, become deteriorated by the action of the moon, while others are apt to contract a rust in lapse of time, or to change their white colour when steeped in oil.

(19.) Some persons give this molar stone the name of “pyrites,”2693 from the circumstance that it has a great affinity to fire;2694 but there is also another kind of pyrites, of a more porous nature, and another,2695 again, which resembles copper. This last, it is said, is found in the mines, near Acamas,2696 in the Isle of Cyprus; one variety of it being of a silver, another of a golden, colour. There are various methods of melting these stones, some persons fusing them twice, or three times even, in honey, till all the liquid has evaporated; while others, again, calcine them upon hot coals, and, after treating them with honey, wash them like copper.

The medicinal properties which these minerals possess are of a calorific, desiccative, dispersive, and resolvent nature, and, applied topically, they case indurations to suppurate. They are employed also, in a crude state and pulverized, for the cure of scrofulous sores and boils. Some writers mention another kind of pyrites also. Those among them have the greatest affinity to fire which we distinguish as “live”2697 pyrites. They are the most ponderous of all, and are found remarkably useful for advance-guards when laying out encampments; for, on being struck with a nail or any other kind of stone, they emit a spark, which, received upon sulphur, dried fungus,2698 or leaves, produces a fire almost sooner than it could be named.