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Northwest Africa 13433
Basic information Name: Northwest Africa 13433
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13433
Observed fall: No
Year found: 2020
Country: Mauritania
Mass:help 24.7 kg
Classification
  history:
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 99 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Oct 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13433 (NWA 13433)

Mauritania

Purchased: 2020 Aug

Classification: HED achondrite (Eucrite, unbrecciated)

History: Two fitting stones (20840 g, 3855 g) found together at an undisclosed location in Mauritania were purchased by Rachid Chaoui in August 2020 from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The studied specimen is quite fresh with a subophitic texture (mean grainsize ~0.6 mm), and is composed predominantly of calcic plagioclase and exsolved pigeonite with accessory silica polymorph, ilmenite, low-Ti chromite and troilite.

Geochemistry: Low-Ca pyroxene host (Fs58.3-61.4Wo2.2-4.8, FeO/MnO = 29-31, N = 3), augite exsolution lamellae (Fs27.1-29.3Wo40.1-42.5, FeO/MnO = 31-34, N = 4), plagioclase (An87.8-89.3Or0.5=0.4, N = 3).

Classification: Eucrite (unbrecciated, diabasic).

Specimens: 22.1 g including one polished thin section at UWB; remainder with Mr. R. Chaoui.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2020 Aug
Mass (g):24695
Pieces:2
Class:Eucrite-unbr
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):58.3-61.4; 27.1-29.3
Wollastonite (mol%):2.2-4.8; 40.1-42.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):22.1
Type spec location:UWB
Main mass:R. Chaoui
Comments:Work name RC136.2; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 127 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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