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That\'s not Kryptonite - it\'s a zircon crystal! A single Hadean zircon crystal shows ion-probe age (1); crystallization temperatures (2); and internal chemical structure (3). Credit: E. Bruce Watson, Rensselaer Polytechnic Institute

That's not Kryptonite - it's a zircon crystal! A single Hadean zircon crystal shows ion-probe age (1); crystallization temperatures (2); and internal chemical structure (3). Credit: E. Bruce Watson, Rensselaer Polytechnic Institute

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