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In the modern times in the United States, what month is represented by opal?
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October |
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December |
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September |
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June |
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Opal is a hydrated amorphous form of silica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid.
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The correct answer was October
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