OPAL
Dictionary of Science, Literature and Art · 1842 · p. 32
A beautiful mineral characterized by its iridescent reflection of light: it is very brittle. It consists of silica, with about 10 per cent, of water. Common opal in some of its characters resembles the preceding; but it has no play of colours, and is abundant, the former being a very rare mineral. Opal is found in different parts ot Europe, but particularly in Hungary; in the East Indies, . (For some curious details as to this stone, seePlin. Hist. Nat., lib. 37. c. 6.) [s. 858]
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