They were a lot different than other meteorites. Isotope ratios are used to date when the rock solidified and they were found to be younger. Different isotope

They were a lot different than other meteorites. Isotope ratios are used to date when the rock solidified and they were found to be younger. Different isotope ratios which are unique and prevalent across different planets were found to be the same as on Mars. Basically there was a rare set of clustered properties which were very similar to properties of the rocks and atmosphere on mars as tested by our various landers. https://en.wikipedia.org/wiki/Martian_meteorite https://en.wikipedia.org/wiki/Martian_meteorite