NWA 10203, Lunar Meteorite, Shocked Gabbro Breccia, Micromount



NWA 10203 was first recovered in 2015 out of the remote Saharan Desert near the border between Mali and Mauritania. Over 20 large fragments were found, weighing a total of approx. 3.3 kilograms. Subsequent paired finds have increased the known total weight. Samples were analyzed at the University of New Mexico and classified as a Lunar Polymict Breccia.

This meteorite has four known lithologies. It has a primary ground mass of olivine gabbro, with varying amounts of plagioclase, anorthosite, pyroxene, and lesser degrees of accessory metals, silica, chromite, and others.

The specimens being offered here are small fragments and part slices that broke off from a larger specimen during cutting. They show an attractive matrix of light-colored clasts set into a shock-blackened matrix.

Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing a single fragment like the one shown. Your fragment may vary slightly in appearance from the one shown and you will receive the largest piece I have remaining. Your specimen will include a labeled gemjar for safe storage.

From the Meteoritical Bulletin entry on NWA 10203 :

Northwest Africa 10203 (NWA 10203)

Purchased: 2015

Classification: Lunar meteorite

History: Purchased by Aziz Habibi in 2015; reportedly found in near the border between Mauritania and Mali.

Physical characteristics: Twenty-seven identically appearing pieces reportedly found together. Irregular exterior, no fusion crust. A saw cut reveals a polymict breccia with numerous fragmental light and dark clasts.

Petrography: (C. Agee, UNM) This polymict breccia has at least four distinct lithologies. 1) unbrecciated olivine gabbro with zoned clinopyroxene (~75%), acicular, plumose plagioclase (~15%), olivine (~5%), and minor titanomagnetite; 2) fragmental anorthositic gabbro breccia with ~75% plagioclase; 3) fragmental gabbroic breccia with approximately equal proportions of plagioclase, pyroxene and olivine; 4) shock melt veins and pools, some of which are vesicular. Accessory FeNi-metal, silica, ilmenite, troilite, chromite, and phosphate were observed in the fragmental breccias.