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Northwest Africa 2650 | |||||||||||||||||||||
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Basic information | Name: Northwest Africa 2650 This is an OFFICIAL meteorite name. Abbreviation: NWA 2650 Observed fall: No Year found: 2004 Country: Morocco Mass: 2.22 kg | ||||||||||||||||||||
Classification history: |
This is 1 of 276 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||
Comments: | Approved 3 Aug 2018 | ||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 2650 (NWA 2650) Morocco Find: 2004 Classification: HED achondrite (Eucrite, monomict) History: A 2224 g complete stone that measures 189 mm × 112 mm × 82 mm at the widest points, with fresh crust was purchased in Erfoud, Morocco Petrography: The meteorite has a texture of brecciated meteorite, with coarse-grained gabbro eucrite fragments and coarse-grained mineral fragments embedded in relatively fine-grained matrix composed of pyroxene and plagioclase fragments. Both shock-induced melt veins and pockets are observed. Mineralogically, this meteorite consists mainly of coarse-grained plagioclase (up to 7 mm) and pyroxenes (up to 5 mm). Other minerals include silica phase, chromite, ilmenite, troilite, and zircon. Almost all of the pyroxene grains exhibit exsolution lamella. Extensive albite, Carlsbad, and complex igneous twinning occur in plagioclase. Geochemistry: The coarse-grained minerals in the coarse-grained gabbro eucrite fragments have compositions almost identical to those in the relatively fine-grained matrix. Orthopyroxene host (En37.2±0.7Fs60.1±1.5Wo2.7±1.3, Fe/Mn=29.9±0.7 n=14), augite exsolution lamella (En29.7±0.4Fs26.4±0.5Wo43.9±0.5, Fe/Mn=29.8±1.8, n=14), plagioclase (An90.5±1.5Ab9.2±1.4, n=17), and chromite (Cr/(Cr+Al)=0.79±0.01, n=8). | ||||||||||||||||||||
Data from: MB107 Table 0 Line 0: |
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Institutions and collections |
NAU: Geology, Bldg 12
Knoles Dr
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012) ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011) NU: School of Earth Sciences and Engineering, Nanjing University, #163 Xianlin Avenue, Nanjing 210023, China, China (institutional address; updated 18 Jul 2015) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Photos: |
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Geography: |
Statistics: This is 1 of 2049 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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