Perhaps it came from Earth when the Chuxhulub asteroid struck?
It's really too bad we weren't able to get a sample from the ['Oumuamua](https://en.wikipedia.org/wiki/%CA%BBOumuamua) asteroid when it flew through the system. It was definitely an extra-solar asteroid, so it would have had material completely unrelated to our own system's formation and history.
It's really too bad we weren't able to get a sample from the ['Oumuamua](https://en.wikipedia.org/wiki/%CA%BBOumuamua) asteroid when it flew through the system. It was definitely an extra-solar asteroid, so it would have had material completely unrelated to our own system's formation and history.