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opal <an opal; opals> N

opal agate MIN

water opal

Monolingual examples (not verified by PONS Editors)

English
The cap takes a high polish and acts as a protective layer for the opal.
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Triplet opals therefore have a more artificial appearance, and are not classed as precious opal.
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Opal must find the true recipe for the orbs and fix them - fast.
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Opals too thin to produce a solid, may be combined with other materials to form attractive gems.
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Gas light had to be filtered by opal glass or light fabric shades.
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The phenomenon is named after the appearance of opals.
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Opal cards can not be purchased from normal station ticket windows or machines.
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Among the more reactive mineral components of some aggregates are opal, chalcedony, flint and strained quartz.
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In some areas there are quartz and opal deposits.
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