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08:06 Apr 15, 2019 |
Polish to English translations [PRO] Tech/Engineering - Construction / Civil Engineering | |||||||
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| Selected response from: Rafal Kwiatkowski United States | ||||||
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Summary of answers provided | ||||
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5 +1 | cristobalite-tridymite opal |
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cristobalite-tridymite opal Explanation: opal with crystallites of cristobalite and tridymite |
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