14068 (7) Crystalline breccia
We would like to thank the following for the use of this sample:
14068 is distinctly different from other Apollo 14 breccias. Round vesicles indicate that the groundmass was once a melt, but it has subsequently quenched to a microcrystalline basaltic texture. The sample is Mg-rich and has abundant metallic iron grains. Unusually, some of the larger crystals in the melt are rounded. The matrix of 14068 is holocrystalline with needles of Mg-rich olivine crystallites. There are a wide variety of mineral and lithic clasts. The texture is that of a rapidly quenched igneous rock. The matrix is olivine rich and the clast assemblage is unusual, with numerous relics of K-rich material.
The sample weighed 35.07 grams before analysis and is 3.73±0.04 billion years old (Ar/Ar).
The mounting resin of this thin section has deteriorated over time and now contains clusters of feathery crystallites within and around the margins of the thin section.
Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/
Ma = Millions of years ago
Rock forming mineral: