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Northwest Africa 2421
Basic information Name: Northwest Africa 2421
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2421
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 498 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 187 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jul 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 2421 (NWA 2421)

(Northwest Africa)

Purchased: Feb 2014

Classification: HED achondrite (Eucrite, brecciated)

Physical characteristics: One rough-surfaced, fusion crusted individual stone.

Petrography: This highly shocked breccia consists dominantly of pyroxene, plagioclase (and maskelynite) and glassy shock-melt. Surviving crystal fragments are up to 2.5 mm (pyroxene) but most of the material has been granulated to <<1 mm. Accessory phases include ilmenite and silica.

Geochemistry: Low-Ca pyroxene clusters near Fs55Wo3, but shows a 5 mol% spread in Mg/(Mg+Fe), along with commensurate-composition, e.g. Fs32Wo33, augite. Pyroxene FeO/MnO averages (26 analyses) 30.6. Plagioclase (26 analyses) is An79-93, average An88.5±2.5.

Classification: Eucrite, breccia.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Feb 2014
Mass (g):498
Pieces:1
Class:Eucrite-br
Shock stage:high
Weathering grade:Light
Ferrosilite (mol%):55
Wollastonite (mol%):3
Classifier:P. Warren, UCLA
Type spec mass (g):30
Type spec location:UCLA
Main mass:Nick Gessler
Comments:Submitted by Paul Warren
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7810 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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