Meteoritical Bulletin: Entry for Northwest Africa 2424

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Northwest Africa 2424

Basic information

Name: Northwest Africa 2424
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2424
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 58 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Martian (shergottite)
Recommended:			Martian (shergottite) [explanation]

This is 1 of 292 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 11 May 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 2424 (NWA 2424)

(Northwest Africa)

Purchased: 2016

Classification: Martian meteorite (Shergottite)

Physical characteristics: Fresh, unstained, 20% covered by dull, smooth fusion crust, remaining surfaces polished by ventifaction. Cut appearance: uniform gray, fine-grained.

Petrography: (P. Warren, UCLA) The rock consists of about 20% olivine phenocrysts, up to 1 mm (2 mm as glomerocrysts), in a much finer-grained pyroxene-dominated groundmass. The minor feldspathic phase is entirely maskelynite.

Geochemistry: Mineral compositions and geochemistry: Olivines are zoned from Fa_21.5to Fa_50.Groundmass pyroxene compositions fan out from Fs₂₆Wo_3.7toward Fs₂₅Wo₂₈and Fs₄₄Wo_11.Pyroxenes in melt inclusions within olivine are systematically more magnesian, e.g., Fs₂₁Wo_28.Pyroxene FeO/MnO (wt.) averages 30.0±2.4. Maskelynite (N=31) is An_44-54, average An_51.5.Bulk composition results from INAA and fused-bead EPMA include Ga = 14.4 ppm, Al₂O₃ = 5.1 wt%; this Ga/Al ratio confirms shergottite affinity.

Classification: Shergottite.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2016
Mass (g):	58
Pieces:	1
Class:	Martian (shergottite)
Shock stage:	high
Weathering grade:	moderate
Fayalite (mol%):	32+±8 (N=82)
Ferrosilite (mol%):	31±6 (N=168)
Wollastonite (mol%):	15±9
Classifier:	P. Warren, UCLA
Type spec mass (g):	14.2
Type spec location:	UCLA
Main mass:	N. Gessler
Comments:	Gessler's address: 2010 Calgary Ln, Los Angeles, CA 90077, USA; 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. 107, MAPS 55, 460-462

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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