I think they are saying the earliest extant minerals that crystalized on Earth are zircons that formed within the first 100 my of the planet's formation. The mi

I think they are saying the earliest extant minerals that crystalized on Earth are zircons that formed within the first 100 my of the planet's formation. The minerals he is talking about show up here on meteorites from elsewhere in the solar systems and predate the planetary nebulae by billions of years.