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CHAP. 31.—SARDA : FIVE VARIETIES OF IT.

Sarda,1 on the other hand, is remarkably useful for this purpose; a stone which shares its name, in part, with sardonyx. It is a common stone, and was first found at Sardes, but the most esteemed kind is that of the vicinity of Babylon. When certain quarries are being worked, these stones are found, adhering, like a kind of heart, to the interior of the rock. This mineral, however, is said to be now extinct in Persia; though it is to be found in numerous other localities, Paros and Assos, for example.

In India2 there are three varieties of this stone; the red sarda, the one known as "pionia," from its thickness, and a third kind, beneath which they place a ground of silver tinsel. The Indian stones are transparent, those of Arabia being more opaque. There are some found also in the vicinity of Leucas in Epirus, and in Egypt, which have a ground placed beneath them of leaf gold. In the case of this stone, too, the male stone shines with a more attractive brilliancy than the female, which is of a thicker substance, and more opaque. Among the ancients there was no precious stone in more common use than this; at all events, it is this stone that is made so much parade of in the comedies of Menander and Philemon. No one, too, among the transparent stones is tarnished more speedily by exposure to moisture than this; though of all liquids, it is oil that acts the most readily upon it. Those stones which are like honey in colour, are generally disapproved of, and still more so, when they have the complexion of earthenware.3

1 Carnelian, a variety of Chalcedony. It is originally grey, or greyish red, which afterwards turns to a rich, deep, red, on exposure to the sun's rays, and subsequently to artificial heat.

2 Which supplies the best carnelians at the present day.

3 From their mixture, Ajasson says, with argillaceous earth.

The Natural History. Pliny the Elder. John Bostock, M.D., F.R.S. H.T. Riley, Esq., B.A. London. Taylor and Francis, Red Lion Court, Fleet Street. 1855.

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