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Oica is the barbarian name given to a stone which is pleasing for its colours, black, reddish yellow, green, and white. Ombria,1 by some called notia,"2 falls with showers and lightning, much in the same manner as ceraunia3 and brontea,4 the properties of which it is said to possess. There is a statement also, that if this stone is placed upon altars it will prevent the offerings from being consumed. Onocardia5 is like kermesberry in appearance, but nothing further is said about it. Oritis,6 by some called "sideritis,"7 is a stone of globular form, and proof against the action of fire. Ostracias,8 or ostracitis, is a testaceous stone, harder than ceramitis,9 and similar in all respects to achates,10 except that the latter has an unctuous appearance when polished: indeed, so remarkably hard is ostritis, that with fragments of it other gems are engraved. Ostritis11 receives its name from its resemblance to an oyster-shell. Ophicardelon is the barbarian name for a stone of a black colour, terminated by a white line on either side. Of Obsian12 stone we have already spoken in the preceding Book. There are gems, too, of the same name and colour, found not only in Æthiopia and India, but in Samnium as well, and, in the opinion of some, upon the Spanish shores that lie towards the Ocean.

1 "Shower stone," apparently.

2 From "Notus," the south wind, which usually brought rain.

3 See Chapters 48 and 51.

4 See Chapter 55 of this Book.

5 "Ass's heart."

6 "Mountain stone."

7 See Chapter 67.

8 "Shell-stone." Not the same, probably, as the Cadmitis or Ostracitis mentioned in Chapter 56 of this Book. See B. xxxvi. c. 31, where a stone of this name is also mentioned. Horn-stone, probably, a Chalcedony, more brittle than flint, is meant in the present passage.

9 See Chapter 56 of this Book.

10 See the beginning of Chapter 54.

11 "Oyster-stone."

12 See B. xxxvi. chap. 67; our "Obsidian."

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