Gems in 4.3-billion-year-old zircon baffle geologists.
References
Menneken et al. Nature 448, 917-921 (2007).
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Callaway, E. Diamonds found in Earth's oldest crystals. Nature (2007). https://doi.org/10.1038/news070820-7
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DOI: https://doi.org/10.1038/news070820-7
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