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Northwest Africa 2656 | |||||||||||||||||||||
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Basic information | Name: Northwest Africa 2656 This is an OFFICIAL meteorite name. Abbreviation: NWA 2656 Observed fall: No Year found: 2003 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 88 approved meteorites classified as Acapulcoite. [show all] Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites | ||||||||||||||||||||
Comments: |
Approved 25 Jun 2006 Revised 3 Feb 2006: Revised writeup | ||||||||||||||||||||
Writeup![]() |
Writeup from MB 90:
Northwest Africa 2656 Morocco or Algeria Find: 2003 Achondrite (acapulcoite) History: A 386 g broken stone with weathered fusion crust (part of a larger ~7.5 kg mass found in 2003) was purchased in Erfoud, Morocco, in 2004 for N. Oakes. Petrography: (T. Bunch and J. Wittke, NAU; A. Irving, UWS) The specimen is recrystallized into homogeneous polygonal and subhedral grains with a grain size of <1 mm and a ~ equal distribution of phases. Composition: Olivine (Fa8.0; FeO/MnO = 16–19 [n = 25]), orthopyroxene (Fs8.4Wo2.4; [n = 17]), plagioclase (An18.3– 21.0Or2.8–3.4), chromite ((Cr/Cr+Al) = 0.85; Mg/(Mg+Fe) = 0.41). Troilite, schreibersite, and kamacite are also present. Oxygen isotopes: (D. Rumble, CIW) Replicate analyses by laser fluorination gave δ17O = 1.71, 1.69; δ18O = 5.05, 5.04; ∆17O = −0.953, −0.973 (all ‰). Classification: Achondrite (acapulcoite); low shock, moderate weathering. Specimens: A 21 g type specimen and one polished thin section are on deposit at NAU. Oakes holds the main mass. | ||||||||||||||||||||
Data from: MB90 Table 2 Line 38: |
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Plots: | O isotopes: | ||||||||||||||||||||
Institutions and collections |
NAU: Geology, Bldg 12
Knoles Dr
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address) Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
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Photos: |
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Geography: |
Statistics: This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |