70255 is a fine-grained Ti-rich basalt. It is a blocky, subangular, homogeneous basalt with 1-2 % vugs. It contains both olivine (rotation 2) and silica as a consequence of rapid crystallization. Complex compositional zoning and a degree of strain has produced remarkable pyroxene crystals (rotation 1).
The sample weighed 277.2 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.