After reading about pieces of meteorites selling for thousands of dollars, David Mazurek decided to learn more about the large rock he had used for decades as a doorstop.

It turns out the 23-pound rock is full of iron and nickel and worth about $100,000, researchers at the Central Michigan University and the Smithsonian Museum determined.

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“I could tell right away that this was something special,” CMU geology professor Mona Sirbescu said. “It’s the most valuable specimen I have ever held in my life, monetarily and scientifically.”

Sirbescu first identified it as more than just a rock. She then sent two pieces of it to the Smithsonian for confirmation.

Mazurek said he got the meteorite with a barn he bought in 1988. The farmer who sold him the property said it landed in the 1930s.

The Smithsonian and a mineral museum in Maine are interested in purchasing it.

“I’m done using it as a doorstop,” Mazurek said. “Let’s get a buyer!”

The Associated Press contributed to this report.