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Northwest Africa 14438
Basic information Name: Northwest Africa 14438
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14438
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 190 g
Recommended:  Winonaite    [explanation]

This is 1 of 83 approved meteorites (plus 1 unapproved name) classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 19 Mar 2022
Writeup from MB 111:

Northwest Africa 14438 (NWA 14438)

(Northwest Africa)

Purchased: 2021 Aug

Classification: Primitive achondrite (Winonaite)

History: Purchased by Shun-Chung Yang and Juan Chen in August 2021 from a dealer in Guelmim, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Protogranular assemblage (mean grainsize ~0.3 mm) of predominantly forsterite and enstatite with subordinate diopside and sodic plagioclase, plus accessory kamacite, taenite, chromite and apatite (both F-rich and Cl-rich varieties). The mafic silicates in this specimen are more ferroan than in other recently-classified winonaites, and the compositions of the halogen-bearing phosphates differ as well.

Geochemistry: Forsterite (Fa6.4-9.2, FeO/MnO = 12-15, N = 4), enstatite (Fs8.8-9.6Wo1.5-2.3, FeO/MnO = 10, N = 4), diopside (Fs4.4±0.0Wo44.5-44.8, FeO/MnO = 8-9, N = 2), plagioclase (Ab80.8-81.4An15.1-15.0Or4.1-3.6, N = 2).

Classification: Winonaite.

Specimens: 20.7 g including a polished endcut and one polished thin section at UWB; remainder with Mr. S.-C. Yang.

Data from:
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2021 Aug
Mass (g):190
Shock stage:low
Weathering grade:low
Fayalite (mol%):6.4-8.2
Ferrosilite (mol%):8.8-9.6; 4.4±0.0
Wollastonite (mol%):1.5-2.3; 44.5-44.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.7
Type spec location:UWB
Main mass:S.-C. Yang and J. Chen
Comments:Work name SCY-49; submitted by A. Irving
   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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
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)

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