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Northwest Africa 2422
Basic information Name: Northwest Africa 2422
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2422
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 125 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 272 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jul 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 2422 (NWA 2422)

(Northwest Africa)

Purchased: Feb 2014

Classification: HED achondrite (Eucrite, monomict)

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

Petrography: Although mildly brecciated, this monomict eucrite clearly shows its original subophitic igneous texture, with plagioclase laths up to 3 mm long. Both major phases, pyroxene and plagioclase, are "cloudy" with abundant microinclusions. Pyroxene shows typical eucrite fine-scale exsolution. Accessory phases include ilmenite and silica.

Geochemistry: Low-Ca pyroxene clusters near Fs60Wo2, with a very narrow (difficult to detect, "equilibrated") spread in Mg/(Mg+Fe), along with commensurate-composition Fs27Wo42 (mostly exsolved) augite. Pyroxene FeO/MnO averages (29 analyses) 31.2. Plagioclase (11 analyses) is An86-91, average An88.5±1.4.

Classification: Eucrite, monomict breccia.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Feb 2014
Mass (g):125
Pieces:1
Class:Eucrite-mmict
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):60
Wollastonite (mol%):2
Classifier:P Warren, UCLA
Type spec mass (g):21
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
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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