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zircon

  • Zircon crystals from Saudia Arabia. (Parent Gery, Wikimedia Commons)
    The Origin Story Of Earth's Oldest Rock
    Victoria Clare
    Scientists have found zircon crystals in Australia that are over 4 billion years old. Since the Earth is just over 4 and a half billion years old, those zircon crystals are the closest thing we have to a time capsule from Earth in its early years.