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Northwest Africa 2353 | |||||||||||||||||
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Basic information | Name: Northwest Africa 2353 This is an OFFICIAL meteorite name. Abbreviation: NWA 2353 Observed fall: No Year found: 2004 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||
Classification history: |
This is 1 of 131 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||
Writeup![]() |
Writeup from MB 89:
Northwest Africa 2353 Northwest Africa Purchased 2004 Achondrite (ungrouped) A stone of 580 g was purchased in Erfoud, Morocco. Description and classification (T. Bunch and J. Wittke, NAU): completely recrystallized into polygonal and subhedral grains; H-group chondrite affinities, but with different oxygen isotopes, no relict chondrules; grain size < 0.5 mm, mean = 0.2 mm; intensely fractured with abundance of subparallel compression fractures. Olivine and pyroxene analyses are within the precision of the electron microprobe. Olivine, Fa17.9, FeO/MnO = 34; NiO = 0.35 +/- 0.12 wt %; orthopyroxene, Fs15.6Wo3.1, FeO/MnO = 19; plagioclase, An13.1Or2.6; chromite, cr# = 87; FeS, Ni = 1.65 wt %; metal (taenite only), Ni = 21.6 wt %; troilite, Ni = 1.36 wt % Ni, trace amount of merrillite; magnetite: NiO = 0.27 +/- 0.10 wt%. Oxygen isotope replicate analyses (T. Larson and F. Longstaffe, UWO) of acid-washed, bulk sample by laser fluorination gave δ17O = 3.16 and 3.3, δ18O = 5.10 and 5.51, and Δ17O = 0.44 and 0.51. Weathering grade, W3 and lightly shocked (S2). Specimens: type specimen, 20.1 g, NAU; main mass, Regelman. | ||||||||||||||||
Data from: MB89 Table 7 Line 194: |
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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) UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
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Geography: |
Statistics: This is 1 of 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names) |