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Northwest Africa 2887
Basic information Name: Northwest Africa 2887
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2887
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 887 g
Meteoritical Bulletin:  MB 107  (2018)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 May 2018
Writeup from MB 107:

Northwest Africa 2887 (NWA 2887)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite)

Physical characteristics: Weathered, slight red caliche stain, 90% covered by dull black fusion crust.

Petrography: (P. Warren, UCLA) The rock is dominated by pyroxene and plagioclase. Its texture is unbrecciated and for the most part fine-grained, but uncommonly heterogeneous: locally coarse (laths up to 4 mm), and elsewhere locally equigranular with 120-degree triple junctions.

Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene: Fs57.5±0.3Wo6.3±0.2 (N=7), high-Ca pyroxene: Fs28.8±0.1Wo41.5±0.2 (N=3). Plagioclase: 5 analyses, range An89.4-92.0. For trace metal component, a single analysis found 0.34 wt% Co, 0.04 wt% Ni. Bulk composition results from INAA and fused-bead EPMA include Al2O3 = 12.5 wt%, Mg# = 40 mol%, Sm = 1.9 ppm.

Classification: The meteorite is a eucrite.

Specimens: manifestly paired stones of 570, 275 and 42 g.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2016
Mass (g):887
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):49±13 (N=10)
Wollastonite (mol%):17±16
Classifier:P. Warren, UCLA
Type spec mass (g):26.7
Type spec location:UCLA
Main mass:N. Gessler
Comments:Gessler's address: 2010 Calgary Ln, Los Angeles, CA 90077, USA; 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. 107, MAPS 55, 460-462
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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