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Northwest Africa 11489
Basic information Name: Northwest Africa 11489
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11489
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 19.7 g
Meteoritical Bulletin:  MB 106  (2018)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 Nov 2017
Writeup from MB 106:

Northwest Africa 11489 (NWA 11489)


Purchased: 2017

Classification: HED achondrite (Eucrite)

History: A single stone weighing 19.7 g was found in Morocco prior to 2016. J. Donald Cline and John Sinclair acquired the sample from a meteorite dealer at the Tucson Gem and Mineral Show in February of 2017.

Physical characteristics: The stone has a flattened tabular shape, is light orange in color and ~60% of the sample is covered in a patchy, dark black, flow-lined fusion crust. A broken face shows a light-gray, crystalline interior.

Petrography: Description and classification (A. Love, App): Crystalline rock composed of granoblastic-textured plagioclase and exsolved pyroxene (with an average grain size of 590 µm). Portions of the sample are crosscut by zones of granular debris composed of host rock. Additional minerals are chromite and Si-polymorph.

Geochemistry: (A. Love, App) Low-Ca pyroxene host Fs45.0±0.7 Wo3.2±1.0 (Fs44.1-46.2 Wo1.6-4.8, FeO/MnO=28.1-28.9, N=12); high-Ca pyroxene exsolution lamellae Fs16.0±0.3 Wo47.0±0.2 (Fs15.4-16.4 Wo46.5-47.4, N=10); plagioclase An97.0±0.3 (An96.5-97.4, N=10).

Classification: HED (equilibrated monomict cumulate eucrite breccia). Textures and compositions show this specimen has experienced thermal equilibration. Mineral compositions suggest this is a cumulate eucrite.

Specimens: PARI holds the main mass. Two slices weighing 4.82 g and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2017
Mass (g):19.7
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):45.0±0.7; 16.0±0.3
Wollastonite (mol%):3.2±1.0; 47.0±0.2
Classifier:A. Love, App
Type spec mass (g):4.82
Type spec location:App
Main mass:PARI
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016)
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 1929 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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