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Definitions of opal
A precious stone, opaque and lustrous, showing a play of various colors. The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919.
A precious stone of a milky hue, remarkable for its changing colors. The american dictionary of the english language. By Daniel Lyons. Published 1899.
The hydrate of silica, of which there are many varieties. Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914.
A kind of resinous quartz of a milk-white, red-brown, green, and pearl-grey colour; a precious stone of numerous varieties, found colourless or exhibiting the play of many colours. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
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