Mars Meteorite NWA 6963

Description

Own a real piece of the red planet Mars at a great price! Like Moon Meteorites these meteorites are among the most thought-after and rarest on the market. Our newly classified Martian meteorites, much to the collector’s delight, belong to the most aesthetic and freshest shergottites, which ever were made available. The designation for this particular mars rock is 'NWA 6963'. Meteorite Designation: NWA 6963 History: (H. Chennaoui Aoudjehane, FSAC) In mid-May, 2012, the NWA 6963 locality, near the river Oued Touflit, became widely known and hundreds of meteorite hunters went to the area searching for more pieces. Pieces ranging from 100 to 700 g have been recovered, as well as a few small pieces (3-10 g), most of them are broken and partially covered by a thin fusion crust. The total mass may be as much as 8-10 kg. Physical Characteristics: The original recovered material was a shiny, dark, 83 g fusion-crusted stone in three pieces. Minimal weathering. Interior shows abundant maskelynite and shock melt vein. Petrography: (C. Agee, UNM) Microprobe examination of a polished epoxy mount shows 60% pyroxene, 35% maskelynite, 2% ulvöspinel, 2% melt pockets with silica, minor merrillite, trace chlorapatite and pyrrhotite. Pyroxenes show core-to-rim zonation. Pyroxene grains 200 μm to >1 mm, maskelynite domains 50 μm to >1 mm. Geochemistry: (C. Agee and N. Wilson, UNM) Two distinct pyroxene compositional trends. Pigeonite Fs29Wo11En59 to Fs58Wo16En26, average: Fs39.7±7.7 Wo13.0±2.3 Fe/Mn=33±3 N=108. Augite Fs21Wo34En45 to Fs39Wo31En30, average: Fs28.1±6.2Wo31.6±1.9 Fe/Mn=31±3 N=24. Maskelynite Or2.3±0.7Ab48.3±2.1An49.4±2.6 N=9. Oxygen isotopes (Z. Sharp, UNM): δ18O=4.332; δ17O=2.528; Δ17O=+0.241 (all per mil). Classification: Achondrite (Martian, shergottite); minimal weathering, high shock grade based on complete transformation of plagioclase to maskelynite. Pyroxene compositional trends are similar, but not identical to Shergotty.