"For 18 years, the answer has been categorically "no" - meteor wrongs, not meteorites", she said.
But Sirbescu said she knew "within seconds" that this rock was special.
Sirbescu sent a small sample to the Smithsonian Institution in Washington DC for further analysis where it was estimated the meteorite could be worth around $100,000.
'It's the most valuable specimen I have ever held in my life, monetarily and scientifically, ' Dr Sirbescu said.
The man, who asked to remain anonymous, obtained the meteorite when he bought his farm in Edmore, Michigan, about 30 miles (48km) southwest of Mount Pleasant.
This rock might be worth as much as The Rock.
It's a story that began out of this world almost a hundred years ago when a meteorite crashed down to earth near Edmore, Michigan.
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A Michigan-based man was gifted the rock by a farmer in 1988 when he bought his property.
The 22-pound meteorite was examined under x-ray fluorescence scanning which determined that it was composed of 88 percent iron and 12 percent nickel (a metal that is relatively rare on Earth).
What makes the meteorite found in MI unique is that it is 88% iron and 12% nickel.
The previous owner said he had seen the meteorite coming down at night some time during the 1930s, adding that it was still warm when he dug it out of the crater.
The farmer said that it had come down onto the property in the '30s - "and it made a heck of a noise when it hit", the new owner recalled him saying, according to CMU's statement.
The rock has sat patiently by the unnamed man's door for three decades, taking the occasional field trip to school with his children for show and tell. The Smithsonian is considering purchasing the meteorite.
He is doing a neutron activation analysis to determine its chemical composition.
"A piece of the early solar system literally fell into our hands", Dr Sirbescu said in a video made by the university to promote its discovery.
The Smithsonian and a mineral museum in ME are considering purchasing the meteorite for display, according to CMU.