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Northwest Africa 5351
Basic information Name: Northwest Africa 5351
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5351
Observed fall: No
Year found: 2007
Country: Morocco
Mass:help 139 g
Meteoritical Bulletin:  MB 99  (2011)  Monomict eucrite
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 285 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 1 Oct 2010
Writeup from MB 99:

Northwest Africa 5351 (NWA 5351)

Erfoud, Morocco

Purchased: Dec 2007

Classification: HED achondrite (Eucrite, monomict)

History: The main mass holder purchased the sample in Tucson from a dealer who told him it was from Erfoud, Morocco.

Physical characteristics: Single, 139 g stone. Dark fusion crust with a rippled texture and shrinkage cracks covers one curved side. The remainder of the exterior consists of a weathered broken surface.

Petrography: (Melinda Hutson and Alex Ruzicka, Cascadia). In thin section, this meteorite shows relatively sharply defined, fine-grained basaltic clasts set in a fragmental matrix. The matrix material appears to be comprised of the same material as that found in the clasts. Clasts are mostly subophitic, although some are granular. Feldspathic material includes (1) twinned plagioclase which is either undeformed or which has weak undulose extinction, and (2) a clouded feldspathic phase that does not have the correct stoichiometry for feldspar, but which is not isotropic, so is not glass. No maskelynite was observed.

Geochemistry: (Melinda Hutson and Alex Ruzicka, Cascadia; Ilya Bindeman, UOr). EMPA analyses: Low-Ca pyroxene (Fs62.6±0.7, Wo2.5±0.6, n=21); "pigeonite" (Fs50.5±7.3, Wo15.4±7.6, n=11) which is probably a mixture of exsolved low-Ca pyroxene and augite; augite (Fs26.6±0.2Wo43.5±0.3, n=3); Fe/Mn ratios (all at%): low-Ca pyroxene Fe/Mn = 31.9 ± 1.4; augite Fe/Mn = 32.9±1.1; "pigeonite" (likely mixture) Fe/Mn = 31.4±1.1. Plagioclase (An87.9±1.9Ab11.7±1.8, n=22). Oxygen isotopes (whole rock): δ17O = -0.219±0.05 ‰, δ18O = 3.70±0.11 ‰

Classification: Achondrite (monomict eucrite). Minimal weathering and shock.

Specimens: 22 g and one thin section are on deposit at Cascadia. Thompson holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Dec 2007
Mass (g):139
Class:Monomict eucrite
Ferrosilite (mol%):61.6±0.7
Wollastonite (mol%):2.5±1.6
Classifier:Melinda Hutson, Alex Ruzicka, Cascadia
Type spec mass (g):22
Type spec location:Cascadia
Main mass:Thompson
Comments:Submitted by Melinda Hutson
Plots: O isotopes:  
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
UOr: Department of Geological Sciences, 1272 University of Oregon, Eugene, OR 97403, United States (institutional address; updated 1 Oct 2010)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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