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Zircon or zirconium silicate is a neosilicate usually found in granite and felsic igneous rocks.  This mineral is usually used as a replacement of diamonds.  Zircons containing uranium, which has radioactively decayed into lead and helium, has been radiometrically dated to be 4.404 billion years old and has proved that there was water on Earth at that time.
Zircão

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