Geologist’s collectible

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Possible Answers: ROCK.

Random information on the term “ROCK”:

The Chicago, Rock Island and Pacific Railroad (reporting marks CRIP, RI, ROCK) was a prominent (Class I) railroad in the midwestern United States, commonly known as the “Rock Island.” In 1854 when the line connected the Mississippi to Chicago and the East Coast, the event was marked by a large promotional voyage called the Grand Excursion. In 1856, the line crossed the first railroad bridge across the Mississippi, connecting farms in Iowa and beyond to Chicago. The line’s abandonment in 1980 ranks as the longest and most complicated in U.S. railroad history.[1] The company was originally founded in Rock Island, Illinois, and the railroad was popularized in the song “Rock Island Line.”
Taken from Wikipedia