: a usually amorphous mineral that is a hydrated silica softer and less dense than quartz and typically with definite and often marked iridescent play of colors and is used especially as a gem
Examples of opal in a Sentence
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Also located in Denio, Bonanza Opal Mine Denio gives visitors the chance to search for opals.
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Ashley J. Dimella Fox News, Fox News, 10 Oct. 2024
There is a close chemical connection to an opal, and the general color and the manner of light reflection are much the same.
—Mark Fischetti, Scientific American, 15 Oct. 2024
October birthstone October has two birthstones: opal and tourmaline.
—Olivia Munson, USA TODAY, 1 Oct. 2024
Do not use Windex on softer gems like pearls, opals, or emeralds, because the ammonia may damage them.
—Melissa Locker, Southern Living, 4 Oct. 2024
See all Example Sentences for opal 
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Ashley J. Dimella Fox News, Fox News, 10 Oct. 2024
There is a close chemical connection to an opal, and the general color and the manner of light reflection are much the same.
—Mark Fischetti, Scientific American, 15 Oct. 2024
October birthstone October has two birthstones: opal and tourmaline.
—Olivia Munson, USA TODAY, 1 Oct. 2024
Do not use Windex on softer gems like pearls, opals, or emeralds, because the ammonia may damage them.
—Melissa Locker, Southern Living, 4 Oct. 2024
See all Example Sentences for opal
Dictionary Entries Near opal
Cite this Entry
“Opal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/opal. Accessed 3 Dec. 2024.
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opal
noun
: a mineral with changeable colors that is used as a gem
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