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| Color origin of phenakites from the Ural emerald mines | 410 |
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| Color origin of phenakites from the Ural emerald mines | 46 | 8 | 7 | 3 | 7 | 6 | 3 |
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| F_Spring_2018_Gems_Gemology.pdf | 300 |
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| Russia | 176 |
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| Kazan | 176 |