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Northwest Africa 14983
Basic information Name: Northwest Africa 14983
     This is NOT an official name: Discredited meteorite.
Abbreviation: NWA 14983
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 800 g
Recommended:  Martian (shergottite)    [explanation]

Comments: Entered 25 May 2022
Revised 26 May 2022: Duplicate of NWA 14904
Writeup from MB 111:

Northwest Africa 14983 (NWA 14983)

(Northwest Africa)

Purchased: 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 Fs14.87±0.88Wo8.60±4.04, n=34 (Fs19.59-25.24En60.57-77.48Wo2.93-17.85 FeO/MnO=17.68-31.07,N=34), high Ca-pyroxene Fs21.75±1.28Wo33.79±2.10, n=51 (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
Date:P 2019
Mass (g):800
Class:Martian (shergottite)
Shock stage:High
Fayalite (mol%):32.94±0.71 (n=62)
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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