Meteoritical Bulletin: Entry for Northwest Africa 2422

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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: 125 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Eucrite-mmict
Recommended:			Eucrite-mmict [explanation]

This is 1 of 280 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 7 Jul 2016

Writeup

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 An_86-91, average An_88.5±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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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