Moon Rock

The museum featured a moon rock from the Apollo 15 mission.

This is a fragment of the "Great Scott Rock", lunar sample 15555 [direct link to 4.8 megabyte PDF], which that PDF notes is "the largest and most intensively studied of the Apollo 15 rocks". This is the 15555,54 display sample taken from the original rock. NASA's Lunar Sample Public Displays page has a "Complete List of Lunar Sample Displays" PDF which indicates that this moon rock was transferred to the Kalamazoo Air Zoo after the Michigan Space and Science Center closed, although I have not seen the moon rock on display there.

The Lunar and Planetary Institute's atlas entry for 15555 [direct link to 1.2 meg PDF] contains additional information on 15555. The LPI also has a page with many photos of the original 15555 sample, as well as photos of the various sections into which 15555 was cut. NASA photo S71-57958 shows the slice of 15555 from which 15555,54 was cut (,54 is the back left sample, next to the black cube, in this photo).