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Northwest Africa 11264
Basic information Name: Northwest Africa 11264
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11264
Observed fall: No
Year found: 2016
Country: Morocco
Mass:help 137 g
Meteoritical Bulletin:  MB 106  (2018)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 605 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 31 May 2017
Writeup from MB 106:

Northwest Africa 11264 (NWA 11264)


Purchased: Feb 2016

Classification: HED achondrite (Eucrite)

History: A single stone of 137 g was found by an anonymous finder in Western Sahara and purchased in February 2016 in Erfoud by Giorgio Tomelleri.

Physical characteristics: The main mass is covered by a black fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi): The thin section analyzed displays a basaltic texture. The major phase is orthopyroxene, with crystals 95-140 μm in width, minor clinopyroxene and anorthitic plagioclase. Several exsolved low-Ca pyroxene crystals are visible, with fine (5-7 μm) pigeonite exsolution lamellae. Minor phases are ilmenite, troilite, chromite, and FeNi metal.

Geochemistry: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) Calcic plagioclase An73.8±1.1Or2.3±0.6, n=7; low-Ca pyroxene (Fs59.8±1.3En38.0±1.1Wo2.2±0.1; n=7; Fe/Mn=30.9±0.3); diopside exsolution lamellae in orthopyroxene (Fs26.6±1.4,En31.7±1.1Wo41.6±0.3; n=8; Fe/Mn = 29.1±0.2). Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ17O = 1.93 ‰, δ18O = 4.13 ‰, Δ17O = -0.22 ‰.

Classification: Eucrite with medium degree of shock and medium degree of weathering.

Specimens: A total of 21.2 g specimen and one thin section is on deposit at MSN-FI. Tomelleri owns the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P Feb 2016
Mass (g):137
Shock stage:medium
Weathering grade:medium
Ferrosilite (mol%):59.8±1.2 (n=6); 26.4±1.0 (n=5)
Wollastonite (mol%):2.2±0.2; 41.2±0.5
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, MSN-FI
Type spec mass (g):21.2
Type spec location:MSN-FI
Main mass:Tomelleri
Comments:Submitted by Vanni Moggi Cecchi
Plots: O isotopes:  
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
MSN-FI: Museo di Storia Naturale “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022)
UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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