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Northwest Africa 2353
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:help 315 g
Meteoritical Bulletin:  MB 89  (2005)  Achondrite-ung
MetBase:  v. 7.1  (2006)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 155 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
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:
  Table 7
  Line 194:
Place of purchase:Erfoud
Mass (g):315
Classifier:Ted Bunch, NAU
Type spec location:NAU
Main mass:Regelman
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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