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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
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 172 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 11 May 2018
Writeuphelp
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:
  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, in preparation (2018)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Chris Spratt   
Mirko Graul   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6423 approved meteorites from (Northwest Africa) (plus 2023 unapproved names)

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