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Northwest Africa 2426
Basic information Name: Northwest Africa 2426
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2426
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 630 g
Meteoritical Bulletin:  MB 107  (2018)  Eucrite-cm
Recommended:  Eucrite-cm    [explanation]

This is 1 of 55 approved meteorites classified as Eucrite-cm.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 May 2018
Writeup from MB 107:

Northwest Africa 2426 (NWA 2426)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite, cumulate)

Physical characteristics: Weathered, red caliche stain, 80% covered by glossy fusion crust showing flow lines and scales. Cut appearance: mottled gray matrix with both lighter and darker gray clasts; one large (~12 mm) clast with white feldspar and deep brown mafic silicates.

Petrography: (P. Warren, UCLA) The rock is dominated by pyroxene and plagioclase. Its texture is for the most part severely brecciated and fine-grained, but scattered clasts preserve vestiges of a medium-grained (1-3 mm) equigranular igneous texture.

Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene: Fs37+/-3,Wo3.5+/-0.9 (N=35), high-Ca pyroxene: Fs15.5±2Wo43±1 (N=10). Pyroxene FeO/MnO (wt.) averages 28±3. Plagioclase: An92.5±0.8 (N=11). Scattered tiny metals have Ni at margin of EPMA detectability: very approximately 0.04 wt%, along with 0.23±0.16 wt% Co (N=10). Bulk composition results from INAA and fused-bead EPMA include Al2O3 = 12.5 wt%, Mg# = 62 mol%, Sm = 0.6 ppm. Despite obscuration of texture by brecciation, high Mg# and low REE indicate cumulate origin.

Classification: Brecciated cumulate eucrite.

Specimens: manifestly paired stones of 254, 232 and 144 g.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2016
Mass (g):630
Shock stage:strong
Weathering grade:moderate
Ferrosilite (mol%):31±9 (N=45)
Wollastonite (mol%):18±17
Classifier:P. Warren, UCLA
Type spec mass (g):20
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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