|Rake sample 78527 has the mineralogy of a norite, but it has also been described as a granulite. It has approximately equal amounts of orthopyroxene and plagioclase. Minor phases include olivine, augite, armalcolite, ilmenite, rutile, chromite, baddeleyite, zirconolite, zircon, K-feldspar, metal and troilite. The rock consists of large seriate, subangular plagioclase (up to 2mm) and orthopyroxene (up to 0.8mm) crystals in a fine-grained recrystallized matrix. Minor olivine occurs as large polygonized grains. Olivine and plagioclase-rich regions of the sample are shown in rotations 1 & 2 respectively.
The sample weighed 5.16 grams before analysis and has been dated at 4.146±0.017 billion years (Ar/Ar).
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.