14303 (44) Crystalline-matrix Breccia
We would like to thank the following for the use of this sample:
14303 has an overall clastic nature being similar to samples 14305 and 14321, in that there is a “clast-in-clast” relationship indicating complex origin. The matrix of 14303 (and similar Apollo 14 breccias) is strongly annealed (thermally metamorphosed). On a very fine scale, the matrix is made up of interlocking grains of plagioclase, low-Ca pyroxene and ilmenite with occasional reaction rims around micro-xenocrysts of olivine, pyroxene or spinel.
The sample weighed 898.4 grams before analysis and its matrix is 3.91±0.04 billion years old (Ar/Ar). Zircon within granite clasts have been dated at 4.308±0.004 billion years old (U/Pb). Our thin section does not show any granite (or troctolite) clasts.
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