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Northwest Africa 11562
Basic information Name: Northwest Africa 11562
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11562
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 1361 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Achondrite-ung
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 26 May 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11562 (NWA 11562)

(Northwest Africa)

Purchased: 2017 Oct

Classification: Ungrouped achondrite

History: Purchased in Temara, Morocco, by Adam Aaronson in October 2017.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen consists of coarser, protogranular regions (mean grainsize 0.25 mm) composed of forsterite and enstatite with some interstitial diopside, altered kamacite and blade-like cohenite, plus much finer-grained, quench-textured regions with the same mineralogy.

Geochemistry: Olivine (Fa1.0-1.1, FeO/MnO = 3-4, N = 3), orthopyroxene (Fs0.9-1.0Wo1.0-2.3, FeO/MnO = 2-3, N = 3), diopside (Fs0.2-0.9Wo36.3-40.5, Al2O3 = 2.0-3.6 wt.%, TiO2 = 0.5-0.6 wt.%, N = 3). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O 1.567, 1.396, 1.479; δ18O 6.345, 6.084, 6.291; Δ17O -1.783, -1.816, -1.843 per mil.

Classification: Achondrite (ungrouped). The oxygen isotope composition plots between the trends for CR and CV chondrites, and far from the trends for most achondrites (except for some ureilites); however, the highly magnesian silicates and evidence for partial melting would seem to preclude any affinity to ureilites.

Specimens: 20.5 g including one polished thin section at UWB; remainder with Ke Zuokai.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2017 Oct
Mass (g):1361
Pieces:1
Class:Achondrite-ung
Shock stage:high
Weathering grade:low
Fayalite (mol%):1.0-1.1
Ferrosilite (mol%):0.9-1.0
Wollastonite (mol%):1.0-2.3
Classifier:A. Irving and P. Carpenter, UWS
Type spec mass (g):20.5
Type spec location:UWB
Main mass:Ke Zuokai
Comments:Work name M2049; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography: 
Coordinates:Unknown.

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

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