Difference between revisions of "Opal"
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== Webster's Dictionary <ref name="term_150427" /> == | == Webster's Dictionary <ref name="term_150427" /> == | ||
<p> (n.) | <p> (n.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. </p> | ||
== The Nuttall Encyclopedia <ref name="term_77544" /> == | == The Nuttall Encyclopedia <ref name="term_77544" /> == | ||
<p> | <p> A variety of quartz, of which the finest kind, precious opal, is translucent, with blue or yellow tint, and when polished with a convex sur face shows an admirable play of colours; it is found chiefly at Cerwenitza, Austria. </p> | ||
==References == | ==References == | ||
Latest revision as of 18:49, 15 October 2021
Webster's Dictionary [1]
(n.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.
The Nuttall Encyclopedia [2]
A variety of quartz, of which the finest kind, precious opal, is translucent, with blue or yellow tint, and when polished with a convex sur face shows an admirable play of colours; it is found chiefly at Cerwenitza, Austria.
