I think that would have to be Winchcombe. It was a fall (which means that it was actively seen falling to Earth) in the UK in 2021 and was recovered extremely quickly, which meant that there was minimal interaction with the Earth’s environment, so we call this pristine. It’s also a special type of meteorite call a carbonaceous chondrite, which are some of the most primitive materials from when the Solar System formed 4.6 billion years ago
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