OPAL
Dictionary of Science, Literature and Art · 1854 · p. 22
A beautiful mineral characterized by its irides cent 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 of Europe, bu' c.particularly6.) in Hungary; in the East Indies, . (For some curious details as to this stone, see Plin. Hist. Nat., lib. 37 [s. 864]
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