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Northwest Africa 13272
Basic information Name: Northwest Africa 13272
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13272
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1603 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 2 May 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13272 (NWA 13272)

(Northwest Africa)

Purchased: 2019 Dec

Classification: Ungrouped achondrite

History: Found in Mauritania and purchased by Rachid and Jaouad Chaoui in December 2019 from a dealer in Zouerat, Mauritania.

Physical characteristics: The specimen lacks fusion crust and is coated by a shiny brown desert patina. Polished interior surfaces reveal the presence of rare tiny specks of partially altered metal.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen has a fine grained, poikilitic igneous texture. Composed predominantly of polysynthetically-twinned, compositionally-zoned pyroxene oikocrysts (with domains of orthopyroxene, pigeonite and subcalcic augite) enclosing chadacrysts of olivine, together with interstitial devitrified silicic glass (pale pink in thin section) plus accessory troilite (some Cr-bearing), Ti-poor chromite and very rare kamacite (some altered to Fe hydroxides). Olivine is preferentially stained pale orange in thin section, and there are some cross-cutting dilation veins filled with comminuted olivine and orthopyroxene. Minor secondary calcite and anhydrite are present.

Geochemistry: Olivine (Fa24.0-29.5, N = 8), orthopyroxene (Fs17.9-19.0Wo2.0-3.8, N = 5), pigeonite (Fs18.9-19.0Wo7.2-9.0, N = 2), subcalcic augite (Fs12.2-12.6Wo33.7-37.1, N = 4). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed bulk subsamples by laser fluorination gave, respectively, δ17O 4.120, 4.159, 4.045; δ18O 5.908, 6.096, 5.717; Δ17O 1.001, 0.940, 1.026 per mil.

Classification: Achondrite (ungrouped, igneous, with oxygen isotopic affinity to L chondrites).

Specimens: 22.1 g including one polished thin section at UWB; remainder held by Mr. R. Chaoui and Mr. J. Chaoui.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Zouerat, Mauritania
Date:P 2019 Dec
Mass (g):1603
Pieces:1
Class:Achondrite-ung
Shock stage:low
Weathering grade:low to m
Fayalite (mol%):24.0-29.5
Ferrosilite (mol%):17.9-19.0; 18.9-19.0; 12.2-12.6
Wollastonite (mol%):2.0-3.8; 7.2-9.0; 33.7-37.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSTL
Type spec mass (g):22.1
Type spec location:UWB
Main mass:R. Chaoui/J. Chaoui
Comments:Work name RC126.3; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7374 approved meteorites from (Northwest Africa) (plus 1957 unapproved names)

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