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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:help 58 g
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 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 Fa21.5 to Fa50. Groundmass pyroxene compositions fan out from Fs26Wo3.7 toward Fs25Wo28 and Fs44Wo11. Pyroxenes in melt inclusions within olivine are systematically more magnesian, e.g., Fs21Wo28. Pyroxene FeO/MnO (wt.) averages 30.0±2.4. Maskelynite (N=31) is An44-54, average An51.5. 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:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2016
Mass (g):58
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
   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 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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