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Northwest Africa 13310
Basic information Name: Northwest Africa 13310
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13310
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 441 g
Recommended:  Eucrite-br    [explanation]

This is 1 of 217 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Jun 2020
Writeup from MB 109:

Northwest Africa 13310 (NWA 13310)

(Northwest Africa)

Purchased: 2020 Jan

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by Darryl Pitt in January 2020 from a dealer in Marrakech, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of mostly gabbroic eucrite clasts plus some clasts with fine grained, intersertal texture within a matrix of related crystalline debris. Minerals are exsolved pigeonite (pale orange in thin section) and calcic plagioclase (exhibiting undulose extinction to polycrystalline structure) together with accessory silica polymorph, ilmenite, Ti-Al-chromite, troilite and zircon, plus secondary calcite, barite and iron hydroxides.

Geochemistry: Low-Ca pyroxene (Fs59.4-61.8Wo4.7-1.7, FeO/MnO = 30-33, N = 5), high-Ca pyroxene (Fs26.5-27.8Wo43.0-43.9, FeO/MnO = 30-32, N = 5), olivine grain (Fa66.1-66.5, FeO/MnO = 46, N = 2), plagioclase (An88.0-91.8Or0.4-0.3, N = 4).

Classification: Eucrite (breccia). Possibly paired with NWA 13314.

Specimens: 27.0 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Marrakech
Date:P 2020 Jan
Mass (g):441
Shock stage:moderate
Weathering grade:low to m
Fayalite (mol%):66.1-66.5
Ferrosilite (mol%):59.4-61.8; 26.5-27.8
Wollastonite (mol%):4.7-1.7; 43.0-43.9
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):27.0
Type spec location:UWB
Main mass:D. Pitt
Comments:Work name MVCH 492; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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