> “It doesn’t appear to have undergone thermal metamorphism, which means it’s been sitting out there, past Mars, untouched, since before any of the planets were created meaning we have the rare opportunity to examine a piece of our primordial past.

It sounds like that's par for the course for this type of meteorite. So it's rare, but not unique: https://en.wikipedia.org/wiki/Carbonaceous_chondrite.

> The carbonaceous chondrites were not exposed to higher temperatures, so that they are hardly changed by thermal processes. Some carbonaceous chondrites, such as the Allende meteorite, contain calcium-aluminum-rich inclusions (CAIs). These are compounds that emerged early from the primeval solar nebula, condensed out and represent the oldest minerals formed in the solar system .[3][4]

> Some primitive carbonaceous chondrites, such as the CM chondrite Murchison, contain presolar minerals...