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Northwest Africa 16450
Basic information Name: Northwest Africa 16450
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16450
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 497 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 330 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 8 Feb 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16450 (NWA 16450)

(Northwest Africa)

Purchased: 2023 Dec

Classification: Martian meteorite (Shergottite)

History: Purchased by Bob Falls in December 2023 from a dealer in Tagounite, Morocco.

Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) Diabasic texture (mean grainsize ~0.8 mm). Composed predominantly of prismatic grains of polysynthetically-twinned, zoned clinopyroxene and lath-like grains of maskelynite together with accessory titanomagnetite (with ilmenite exsolution lamellae), pyrrhotite, merrillite and anorthoclase plus minor secondary barite. Symplectitic intergrowths of fayalite + silica polymorph are present adjacent to ferropigeonite rims on clinopyroxene grains.

Geochemistry: Subcalcic augite (Fs26.4-51.3Wo19.1-32.5, FeO/MnO =30-38, N = 6), ferropigeonite (Fs69.2-77.8Wo14.2-19.2, FeO/MnO = 37-41, N = 4), maskelynite (An49.1-52.3Or1.2-1.9, N = 4), fayalite in symplectite (Fa90.9-97.0, FeO/MnO = 28-34, N = 4), anorthoclase (Ab48.7Or37.8An15.4).

Classification: Shergottite (aphyric, diabasic).

Specimens: 24.6 g including one polished thin section at UWB; remainder with Mr. R. Falls.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Tagounite
Date:P 2023 Dec
Mass (g):497
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):90.9-97.0
Ferrosilite (mol%):26.4-51.3; 69.2-77.8
Wollastonite (mol%):19.1-32.5; 14.2-19.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):24.6
Type spec location:UWB
Main mass:R. Falls
Comments:Work name JC 100; submitted by A. Irving
Institutions
   and collections		 UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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