67718 is a coherent, fine-grained impact melt rock. It is one of thirty-two rake samples that were collected near House rock on the rim of North Ray Crater. 67718 contains abundant clasts of plagioclase feldspar set in an aphanitic groundmass. The plagioclase shows no evidence of shock (rotation 2). However, shock features can be seen in the small clast of anorthosite shown in rotation 1.
The sample weighed 41 grams before analysis and has not been dated.
Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/
The Apollo 16 landing site was in the hilly region around Descartes crater in the lunar highlands. The landing spot was chosen to allow the astronauts to gather geologically older lunar material (Descartes Formation and the Cayley Formation) than the samples obtained in the first four landings, which were in or near lunar maria.
The mission lasted 11.1 days, with a stay on the lunar surface of 71 hours. The crew were on the lunar surface for 20.2 hours during which they traversed approximately 27 kilometers and collected approximately 96 kilograms of samples.
Apollo 16 was launched on 16 April 1972.