This is not an April Fool’s story.

The MTA agency in charge of the Second Avenue subway construction project got its 10,000th visitor to its Upper East Side community center Wednesday -- Alisa Becker, who lives in the 96 th Street station area -- and gave her a rock.


It wasn’t any ordinary rock that MTA Capital Construction President Michael Horodniceanu presented  her with as she walked through the doors.

It was Manhattan schist.

The very bedrock that makes this city … well … rock solid.

The schist, mounted on a plaque, was excavated from deep below the avenue.

The Second Ave. Community Information Center opened nearly two years ago , in part to educate the public about the massive project, why it is needed, and what’s going on below ground that sometimes disrupts life above ground.

Located at 1628 Second Ave. between East 84th and East 85th streets, it is open Mondays, Wednesdays and Fridays from 10 a.m. to 6 p.m., Tuesdays and Thursdays from 11 a.m. to 7 p.m. and the second Saturday of each month from 11 a.m. to 3 p.m.

Phase 1 of the Second Avenue Subway is set to open in two years and will run from 96th Street to 63rd Street as an extension of the Q train.

Future phases will one day build out the line up to 125th Street and down to Hanover Square in the Financial District.