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What is the Definition of Opal?
Answer
Opal is a gemstone consisting of hydrated silica that is typically semi-transparent and that shows varying colours against a pale or dark ground. It is also a mineraloid gel that is deposited at a relatively low temperature.
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harlequin opal: a reddish opal with small patches of brilliant color
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black opal: a dark colored opal with internal reflections of green or red
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a genetic alteration that causes the synthesis of a polypeptide chain to terminate prematurely because the triplet of nucleotides that normally codes for the next amino acid in the
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Endoscopy An endoscopic device with hollow retractable needle electrode, which allows insertion of 5-French probe for delivering electrolytes, irrigants, anesthetics and other fluids
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Girasol is a type of opal reflecting a reddish glow. An opal is a mineraloid gel that is deposited at a moderately low temperature and may occur in the fissures ...
Chloropal is a massive mineral that is greenish in color and opal-like in appearance. It is an essentially hydrous silicate of iron. Chloropal has synonyms which ...
Hydrophane is a mineral and a variety of opal that is very porous and absorbs a lot of water. When dry it is almost opaque but turns transparent as it absorbs ...