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Northwest Africa 5739
Basic information Name: Northwest Africa 5739
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5739
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1730 g
Recommended:  Eucrite    [explanation]

This is 1 of 560 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Jul 2022
Writeup from MB 111:

Northwest Africa 5739 (NWA 5739)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Eucrite)

History: The meteorite was exported from Morocco for purchase by N. Gessler.

Physical characteristics: A subround single individual stone, 30% covered by brown stained semi matte black coarsely crazed fusion crust, and 10% by secondary matte black grainy fusion crust. Cut and broken faces show a medium light gray N6 matrix with inclusions <4 cm.

Petrography: The meteorite is fragmental, probably polymict breccia, dominantly pyroxene and plagiolcase, with typical grain size 0.05 mm; surviving subophitic clasts (with very fine-scale pyroxene exsolution) are up to 2 mm.

Geochemistry: Pyroxene (15 analyses) ranges from Fs43.5Wo1.2 to Fs59.0Wo2.5 to Fs48.3Wo15.2, and averages Fs52.2Wo7.2, with FeO/MnO (wt ratio) = 32.8. Plagioclase (8 analyses) ranges from An86.6 to An 92.3 and averages An90.1.

Classification: Eucrite, brecciated

Specimens: Main mass with Gessler, type specimen, including multiple thin sections, at UCLA.

Data from:
  Table 0
  Line 0:
Date:P 2019
Mass (g):1730
Shock stage:S2
Weathering grade:moderate
Ferrosilite (mol%):52.2
Wollastonite (mol%):7.2
Classifier:P. Warren, UCLA
Type spec mass (g):48
Type spec location:UCLA
Main mass:Nick Gessler
Comments:Gessler's address: 2010 Calgary Lane, Los Angeles, CA 90077; submitted by Paul Warren
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 8580 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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