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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
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

Comments: Entered 25 May 2022
Revised 26 May 2022: Duplicate of NWA 14904
Writeuphelp
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:
  MB111
  Table 0
  Line 0:
Place of purchase:Northwest Africa
Date:P 2019
Mass (g):800
Pieces:1
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
Institutions
   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)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography: 
Coordinates:Unknown.
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Revision
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