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1 Opals are hydrated silica, the amount of water varying.
2 On the contrary, precious Opal is found in Hungary, at Frankfort, and in Honduras, and other varieties in numerous parts of the world, including the East Indies.
3 See Chapter 25 of this Book.
4 See B. xxxv. c. 28.
5 The largest opal known is in the Imperial cabinet at Vienna. It is the size of a man's fist, and weighs 17 ounces, but is full of fissures.
6 See Carm. 53 of the Poems of Catullus.
7 A.U.C. 788.
8 See B. viii. c. 47. He alludes to the story of the Beaver.
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