A recent article published in Science features the Martian meteorite NWA 7034 (aka Black Beauty), and details its discovery and distribution among collections.
CMS holds a 20-gram cut of Black Beauty, which is a polymict breccia containing a diverse assemblage of igneous and “sedimentary” materials. It was most likely produced by impact, but also involved volcanic and low-temperature alteration processes. The bulk chemical composition of this meteorite closely matches that of the Martian crust as measured by NASA’s Mars Exploration Rovers and Mars Odyssey Orbiter. It also contains the most amount of water (approximately ~0.6 wt%) of any of the known Martian meteorites.
See the CT image movie of the Center's slice of this unique and rare meteorite here.
Photo: NWA 7533, aka Black Beauty (Photo credit: NASA).