14064 (21) Light matrix breccia
We would like to thank the following for the use of this sample:
14064 is a friable breccia having about 40% of sub-angular to sub-rounded clasts in a very light-grey matrix. Dark clasts are subordinate to light clasts, and there is some glass. It is a polymict breccia composed of a mixture of lithic and mineral clasts in a fine-grained matrix with seriate grain size distribution. Plagioclase is the dominant mineral, with subordinate pyroxene, olivine, ilmenite, spinel and metallic iron grains.
The sample weighed 107.5 grams before analysis and is 3.81±0.04 billion years old (Ar/Ar).
Rotation 1 shows a fine-grained basalt clast containing a pinkish-brown spinel crystal. Our thin section is slightly thick and in places displays plagioclase feldspar as pale yellow crystals (in XPL). Rotation 2 shows some of these crystals and two fragments of brown glass.
Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/
Ma = Millions of years ago
Rock forming mineral:
- metallic iron