You don’t have to be alive to go extinct.

Geologists in Sweden have found what they call the first-ever “extinct” meteorite buried within a 470-million-year old limestone slab. The new space rock belongs to a family of meteorites that once bombarded Earth, but no longer plunge to the planet, according to a paper published Tuesday in the journal Nature Communications.

“No similar meteorite is known on Earth of the 50,000 meteorites that have been found,” said Birger Schmitz, a geologist from Lund University in Sweden, and lead author of the paper.

Half a billion years ago, two asteroids between Jupiter and Mars are believed to have collided, spewing celestial shrapnel across the solar system. Countless pieces flew past Earth, but some crash-landed in its ancient oceans. Following millions of years of sediment buildup and compression, the meteorites fossilized, much like the trilobites and shellfish that shared the seafloor.

Eventually, miners in a Swedish quarry came across the fossilized meteorites among limestone that was destined to be made into floor panels. At first they began throwing the ugly black rocks into the dump, until a geologist finally got a look at one and realized its significance.