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Northwest Africa 14904
Basic information Name: Northwest Africa 14904
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14904
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 800 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 300 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 9 May 2022
Writeup from MB 111:

Northwest Africa 14904 (NWA 14904)

(Northwest Africa)

Find: 2019

Classification: Martian meteorite (Shergottite)

History: Purchased by Adam Aaronson in Temara, Morocco, in 2019

Petrography: Poikilitic Shergotitte with characteristic bimodal texture. Poikilitic areas contain large pyroxene oikocrysts enclosing chadacrysts of olivine. Non-poikilitic areas consist of large anhedral olivine grains, pyroxene, and maskelynite. Accessory phases include merrillite, associated with maskelynite, chromite, ilmenite, and sulfides. Significant evidence of shock is seen: pockets of dark brown shock melt with vesicles and shock veins are prevalent. Olivine microlites are common, as is shock darkening of olivine, and abnormal birefringence colors; areas of shock recrystallized olivine are also present.

Geochemistry: Olivine Fo65.15-69.12Fa30.88-34.85, FeO/MnO=46.49-66.14, (N=62), low-Ca pyroxene Fs19.59-25.24En60.57-77.48Wo2.93-17.85 FeO/MnO=17.68-31.07 (N=34), high Ca-pyroxene Fs13.10-17.05En48.23-54.23Wo30.01-38.20, FeO/MnO=17.68-31.07 (N=51), maskelynite An48.33-54.72Ab43.97-48.99Or0.07-2.92 (N=54)

Classification: Martian (Poikilitic Shergottite)

Specimens: 174.97 g end cut plus 6 one-inch round thin section on deposit at TCU, P. Mani holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Northwest Africa
Mass (g):800
Class:Martian (shergottite)
Shock stage:high
Fayalite (mol%):32.94±0.71 (n=62)
Ferrosilite (mol%):14.87±0.88 (n=34)
Wollastonite (mol%):8.60±4.04 (n=34)
Classifier:R.G. Mayne and E.J. Gackstatter, TCU
Type spec mass (g):174.97
Type spec location:TCU
Main mass:P. Mani
Comments:Submitted by R.G. Mayne
   and collections
TCU: Oscar E. Monnig Collection, Department of Geology, Texas Christian University, Ft. Worth, TX 76129, United States; Website (institutional address; updated 24 Feb 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)
Synonymshelp: Northwest Africa 14983 (Duplicate entry)
NWA 14983 (Duplicate entry)

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