4.4 billion-year-old crystal oldest-known fragment of Earth

de bene esse: literally, of well-being, morally acceptable but subject to future validation or exception

 Rock of Ages: Microscopic 4.4 billion-year-old crystal is the oldest-known fragment of Earth

The tiny piece of zircon crystal was found on a sheep ranch in the Jack Hills region of Western Australia and sheds new light on how early...