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Northwest Africa 13307
Basic information Name: Northwest Africa 13307
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13307
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 467 g
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 99 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 13 Jun 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13307 (NWA 13307)

(Northwest Africa)

Purchased: 2020 Apr

Classification: Ungrouped achondrite

History: Found in Mauritania, purchased by Rachid and Jaouad Chaoui in March 2020 from a Mauritanian dealer ans subsequently sold to Luc Labenne.

Physical characteristics: A single stone (467 g) partly coated by black fusion crust. The fresh interior is a friable aggregate of colorless to pale gray, equant grains.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Protogranular aggregate (mean grainsize ~1.2 mm) composed predominantly of subequal amounts of diopside and enstatite with minor accessory daubreelite, ferroan alabandite and Ti-Cr-bearing troilite. Both pyroxenes exhibit fine, blebby and irrational exsolution of the other pyroxene phase, and also contain patchy, compositionally different domains. No metal or olivine was observed despite a diligent search.

Geochemistry: Enstatite (Fs0.2±0.0Wo1.7-4.5, FeO/MnO = 0.3, N = 3), diopside (Fs0.1±0.0Wo39.7-40.5, FeO/MnO = 0.2, N = 2), homogeneous low-Ca pyroxene domain within diopside (Fs0.2Wo8.3, FeO/MnO = 0.3).

Classification: Achondrite (ungrouped, magnesian websterite, reduced).

Specimens: 22.2 g including two polished thin sections at UWB; remainder held jointly by Mr. R. Chaoui and Mr. J. Chaoui.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2020 Apr
Mass (g):467
Pieces:1
Class:Achondrite-ung
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):0.2±0.0; 0.1±0.0
Wollastonite (mol%):1.7-4.5; 39.7-40.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):22.2
Type spec location:UWB
Main mass:L. Labenne
Comments:Work name RC130.3; 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)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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