74115 is a rounded, very friable sample of light grey polymict regolith breccia with a fine-grained matrix consisting of angular mineral and glass fragments. Some of the larger clasts are lithic fragments including very dark glassy breccias (rotation 1), granulites, feldspathic breccias and feldspathic impact melts, as well as some high-Ti mare basalts. Orange glass spheres (rotation 2) and shards are conspicuous. 74115 has also been referred to as a soil clod.
The sample weighed 37 grams before analysis and has not been dated.
Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/
Apollo 17, the final manned landing mission, had two objectives: to obtain samples of ancient rocks from the lunar highlands and to look for evidence of younger volcanic activity on the valley floor.
This small Collection contains material deriving from both periods, including igneous rocks around 4.3 billion years old from the lunar highlands as well as younger volcanic samples dating from about 3.6 billion years ago.
Apollo 17 was launched on 7 December 1972.