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Northwest Africa 13574
Basic information Name: Northwest Africa 13574
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13574
Observed fall: No
Year found: 2020
Country: Morocco
Mass:help 1525 g
Recommended:  Howardite    [explanation]

This is 1 of 421 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 16 Dec 2020
Writeup from MB 109:

Northwest Africa 13574 (NWA 13574)


Purchased: 2020

Classification: HED achondrite (Howardite)

History: A single stone weighing 1525 g was found by a nomad in Western Sahara. This meteorite was purchased in 2020 by Carlos Muñecas (Expometeoritos) in Errachidia, with the help of Hmad Ait Hssain.

Physical characteristics: Sample is irregularly shaped and shows broad regmaglypts. A black, contraction-cracked fusion crust covers approximately 70% of the sample. The interior is light gray and shows a fine-grained, brecciated texture.

Petrography: Description and classification (A. Love, App) Sample is a polymict breccia composed of a subequal, comminuted mixture of diogenite and eucrite mineral fragments with sparse angular lithic clasts up to 5mm. Lithic fragments are: basaltic and cumulate-textured eucrite, rare diogenite, shock-darkened and impact melt clasts. Pyroxenes are exsolved. Additional minerals are: ferroan olivine, an Si polymorph, apatite, chromite, ilmenite and troilite.

Geochemistry: (A. Love, App) Diogenite: Olivine (Fa33.5, Fe/Mn=46.0, Mg#=66.5, n=1); low-Ca Pyroxene (Fs22.2±3.3Wo2.6±0.7, Fe/Mn=28.9±2.5, Mg#=77.1±3.6 n=5); eucrite: olivine (Fa82.2-96.6, Fe/Mn=43.4±2.6, Mg# 3.4-17.7); low-Ca Pyroxene (Fs43.4±9.0Wo4.8±2.0, Fe/Mn=29.2±2.1, n=9); pigeonite (Fs55.2±7.0Wo8.3±1.7, Fe/Mn=29.9±1.9, n=11); high-Ca pyroxene (Fs38.5±13.3Wo35.3±6.3, Fe/Mn=33.7±3.9, n=12); plagioclase (An92.8±3.5Or0.1±0.1, n=9).

Classification: Achondrite (howardite). Mineral compositions and textures indicate this sample is an HED achondrite. Subequal abundance of eucrite and diogenite mineral fragments indicate sample is a howardite.

Specimens: Carlos Muñecas (Expometeoritos) holds the main mass. Two fragments totaling 22.85 g and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Errachidia, Morocco
Date:P 2020
Mass (g):1525
Shock stage:low
Weathering grade:low
Fayalite (mol%):33.5 (Dio); (82.2-96.6) (Euc)
Ferrosilite (mol%):22.2±3.3; 43.4±9.0; 38.5±13.3
Wollastonite (mol%):2.6±0.7; 4.8±2.0; 35.3±6.3
Magnetic suscept.:3.70
Classifier:A. Love, App
Type spec mass (g):22.85
Type spec location:App
Main mass:Carlos Muñecas (Expometeoritos)
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)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 1887 approved meteorites from Morocco (plus 26 unapproved names) (plus 1 impact crater)

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