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Northwest Africa 1871
Basic information Name: Northwest Africa 1871
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1871
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 574 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 1871 (NWA 1871)

(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, 40% covered by matte black partially orange stained, coarsely crazed fusion crust. Cut and broken faces show a medium light gray N6 matrix with inclusions <15 mm.

Petrography: The meteorite is intensely brecciated. The matrix appears nearly opaque in thin section, with typical grain size 0.02 mm. Scattered clasts are up to 6 mm, the largest being a brecciated basalt with granoblastic polygonalism evident in the pyroxene. Possibly paired with NWA 1861.

Geochemistry: Pyroxene (12 analyses) ranges from Fs36.3Wo5.5 to Fs56.9Wo3.5 to Fs32.3Wo34.2, and averages Fs47.5Wo8.6, with FeO/MnO (wt ratio) = 31.9. Plagioclase (9 analyses) ranges from An82.1 to An 93.6 and averages An89.1.

Classification: Eucrite, brecciated, probably polymict

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

Data from:
  Table 0
  Line 0:
Date:P 2019
Mass (g):574
Shock stage:S2
Weathering grade:moderate
Ferrosilite (mol%):47.5
Wollastonite (mol%):8.6
Classifier:P. Warren, UCLA
Type spec mass (g):36
Type spec location:UCLA
Main mass:Nick Gessler
Comments: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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