2025年3月3日 · Name: Northwest Africa 2975 This is an OFFICIAL meteorite name. Abbreviation: NWA 2975 Observed fall: No Year found: 2005 Country: Algeria Mass: 70.1 g Classification

NWA 2975 is an enriched basaltic shergottite with a medium-grained, subophitic to granular texture. Pyroxenes in NWA 2975 show complex and “patched” compositional zoning that is distinct from that observed in Shergotty and QUE 94201. Mg-rich cores have late-stage Fe-rich rims that often contain exsolution features.

2015年11月13日 · We present a study of the petrology and geochemistry of basaltic shergottite Northwest Africa 2975 (NWA 2975). NWA 2975 is a medium-grained basalt with subophitic to granular texture. Electron microprobe (EMP) analyses show two distinct pyroxene compositional trends and patchy compositional zoning patterns distinct from those observed in other ...

NWA 2975 (Paired) Martain Meteorites for Sale. Location: Reportedly from Algeria--purchased from intermediaries in Morocco. Found: 2005. Classification: Achondrite, Martian Shergottite (Enriched Mafic)

According to Wittke et al. (2006), NWA2975 is a fresh, medium-grained, subophitic to granular hypsbyssal basalt with intergrown prismatic pyroxene and plagioclase grains up to 3 mm long (figure 2). The hand specimen also exhibits vesicular black glass veins up to 3 mm wide and glass pockets up to 6 mm (figure 4).

Classified as a basaltic shergottite, contains veins and patches of shock-produced vesicular glass. NWA 2975 and NWA 2986 (note that Michael Farmer or Jim Strope only can used the numbers NWA 2975 and NWA 2986).

Petrography: (T. Bunch and J. Wittke, NAU; A. Irving, UWS) A medium-grained (<3.1 mm greatest dimension) basaltic shergottite that consists of ~57.3 vol% augite and pigeonite pyroxenes, and 38.3 vol% plagioclase (present as shock-formed maskelynite and glasses) with minor opaques (2.7 vol%) and phosphates (1.7 vol%) arranged in a weakly foliated...

northwest africa 2975: an evolved basaltic shergottite with vesicular glass pockets and trapped melt inclusions. J.H. Wittke, T. E. Bunch, A. J. Irving, M. Farmer, J. Strope, Dept. of Gelogy, Northern Arizona University, Flagstaff, AZ 86011, Dept. of Earth & Space Sciences, University of Washington, Seattle, WA 98195.

Complete NWA 2975 stone, showing very fresh fusion crust. Image © M. Farmer. Petrology: NWA 2975 is a medium-grained, subophitic to granular volcanic or hypabyssal rock composed predominantly of pyroxenes (57.3 vol.%) and completely maskelynitized plagioclase (38.3 vol. %) with accessory opaque phases (2.7 vol.%) and phosphates (1.7 vol.%).

NWA 2975 is medium-grained and consists of pale green prismatic pyroxene (augite and pigeonite) intergrown with white/colourless plagioclase feldspar that has been entirely converted to maskelynite due to shock metamorphism. Minor constituents include the phosphate merrillite and three opaque species (ilmenite, pyrrhotite and ulvospinel).