60016 (227) Ancient Regolith Breccia
We would like to thank the following for the use of this sample:
60016 is a fragmental polymict breccia and is regarded as an “ancient” regolith breccia, presumably formed during the period of basin formation. It has a light grey matrix with both light and dark clasts. It is friable with a porous clastic matrix with seriate grain size from several mm downwards. It contains lithic clasts including cataclastic and recrystallized anorthosite, coarse-and fine-grained poikilitic impact melt, granoblastic material, noritic anorthosite, dark matrix breccias, and several types of glass fragments in various stages of devitrification. Nearly all the dark matrix clasts are aphanitic melts. Our thin section appears to have sampled part of a shocked and polygonised anorthosite clast.
The sample weighed 4307 grams before analysis. Two clasts and have been dated at ~3.8 billion years (Ar/Ar).
Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/
Ma = Millions of years ago
Rock forming mineral: