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Northwest Africa 13910
Basic information Name: Northwest Africa 13910
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13910
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 500 g
Recommended:  Howardite    [explanation]

This is 1 of 421 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 25 Apr 2021
Writeup from MB 110:

Northwest Africa 13910 (NWA 13910)

(Northwest Africa)

Purchased: 2021 Jan

Classification: HED achondrite (Howardite)

History: Purchased by Grant Harkness in January 2021 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Complex polymict breccia containing multiple types of lithic clasts plus related mineral debris in a finer grained matrix. Lithic clasts include eucrites (with subophitic, gabbroic and partially recrystallized textures) and some feldspathic diogenite. The mineral clast population includes abundant diogenitic orthopyroxene (exhibiting undulose extinction), exsolved pigeonite and calcic plagioclase, together with accessory silica polymorph, ilmenite and troilite. The overall proportion of diogenitic to eucritic material is estimated from a large area thin section to be approximately 65:35.

Geochemistry: Diogenitic orthopyroxene (Fs17.7Wo0.4; Fs24.7Wo1.8; FeO/MnO = 29-31; N =2), eucritic ferroan low-Ca pyroxene (Fs56.2Wo5.3, FeO/MnO = 31), eucritic ferroan pigeonite (Fs59.0Wo12.3, FeO/MnO = 31), eucritic augite (Fs29.6Wo40.5, FeO/MnO = 29), low-Ca pyroxene (Fs40.3Wo1.7; Fs41.9Wo5.8; Fs47.4Wo4.5; FeO/MnO = 27-30; N = 3), plagioclase (An84.7Or0.8; An93.7Or0.2; N = 2).

Classification: Howardite.

Specimens: 40.16 g including one polished thin section at PSF; remainder in the Harkness Collection.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021 Jan
Mass (g):500
Shock stage:low
Weathering grade:low
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):40.2
Type spec location:PSF
Main mass:Harkness Collection
Comments:Work name HC-26; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
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)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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