According to CNN, a man says he inherited the rock when he bough a MI farm in 1988. It came with a weird rock that was used to prop open the door of a shed.
David tells FOX 17 he's going to wait a while and let the price value go up on his space rock nest egg.
Despite the rock's out-of-this-world origin, the farmer threw it in with his property, and Mazurek kept it for more than three decades. He reportedly used the meteorite as a doorstop and sent it to school with his children for show and tell.
The process has been an invaluable lesson for Sirbescu and her students.
Professor Monaliza Sirbescu shows off a meteorite that's been in a Grand Rapids man's home for years.
The meteorite, which is around the size of a cantaloupe, weighs over 22 pounds (10 kilograms).
The man then made a decision to take his rock to Mona Sirbescu, a geology faculty member in earth and atmospheric sciences at Central Michigan University.
"For 18 years, the answer has been categorically "no" - meteor wrongs, not meteorites", she said.
Upon receiving the meteorite, Sirbescu evaluated it and discovered it was an iron-nickel meteorite, composed of 8 to 8.5 percent iron and 11.5 percent nickel.
That was all Mazurek needed to hear. The rock was reportedly found in the 1930s on a MI farm, where it was put to use as a doorstop.
Already, a bidding war is brewing over the rock, which is the sixth-biggest in Michigan's history and just the 12th identified there.
The Smithsonian and a mineral museum in ME are considering purchasing the meteorite for display, according to CMU.
More tests are being conducted to see if the meteorite contains rare elements.
"It's the most valuable specimen I have ever held in my life, monetarily and scientifically", she said.
Mazurek said that when he sells the meteorite, he'll donate some of the money to the university.