For the Earth to have so much today - 70% of its surface is covered by ocean - suggests there must have been a later addition.
And the fact it was recovered less than 12 hours after crashing means it had absorbed very little earthly water, or indeed any contaminants.
"This means when we measure it, we know the composition we're looking at takes us all the way back to the composition at the beginning of the Solar System, 4.6 billion years ago.
It then took only 200,000 to 300,000 years to arrive on Earth, the number of particular atoms, such as neon, created in the meteorite material through the constant irradiation from high-speed space particles, or cosmic rays, reveals.
"Researchers will continue to work on this specimen for years to come, unlocking more secrets into the origins of our Solar System," co-first author Dr Luke Daly, from the University of Glasgow, said.