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Northwest Africa 13572
Basic information Name: Northwest Africa 13572
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13572
Observed fall: No
Year found: 2020
Country: Western Sahara
Mass:help 1650 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 5 Dec 2020
Writeup from MB 109:

Northwest Africa 13572 (NWA 13572)

Western Sahara

Purchased: 2020

Classification: HED achondrite (Howardite)

History: A nomad found the 1650 g sample in three pieces Western Sahara. Samples were purchased by Carlos Muñecas (Expometeoritos) in Errachidia, with the help of Hmad Ait Hssain in 2020.

Physical characteristics: Samples occur as fragments from a larger, irregularly shaped mass. Exterior is coated in a layer or dark orange caliche. Dark wind ablated fusion crust coats approximately 30% of sample.

Petrography: Description and classification (A. Love, App) Polymict breccia composed of mm-sized, angular lithic and mineral clasts of eucrite and diogenite. Clast lithologies are: fine-grained basalts with zoned phenocrysts, recrystallized cumulate clasts, brecciated clasts, impact melt lithologies, pyroxene-rimmed Si clasts and diogenite mineral fragments and breccias. Additional minerals are: olivine, chromite, troilite, ilmenite and phosphates.

Geochemistry: (A. Love, App) Diogenite: Olivine, Fa55.2±6.7 (Fe/Mn=50.3±1.8, Mg#=44.8±6.7, n=9); low-Ca pyroxene, Fs27.8±3.2Wo3.4±1.0 (Fe/Mn=30.3±4.5, Mg#=71.2±3.4 n=14); eucrite: low-Ca pyroxene, Fs44.5±8.2Wo3.7±1.1 (Fe/Mn=30.5±1.7, n=14); pigeonite, Fs42.3±9.5Wo12.9±10.1 (Fe/Mn=29.8±1.7, n=13); high-Ca pyroxene, Fs26.6±12.0Wo38.6±7.7 (Fe/Mn=27.3±3.3, n=13); plagioclase, An94.1±1.2Or0.1±0.1 (n=7).

Classification: HED achondrite (howardite M-S2, low weathering). Sample is an HED achondrite based on textures of clasts and Fe/Mn ratios in pyroxenes. Sample is a howardite based on subequal abundance of eucrite and diogenite.

Specimens: Carlos Muñecas (Expometeoritos) holds the 265 g main mass. A fragment weighing 22.24 g a mount 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):1650
Shock stage:M-S2
Weathering grade:low
Fayalite (mol%):55.2±6.7
Ferrosilite (mol%):27.8±3.2; 44.5±8.2; 26.6±12.0
Wollastonite (mol%):3.4±1.0; 3.7±1.1; 38.6±7.7
Magnetic suscept.:3.15
Classifier:A. Love, App
Type spec mass (g):22.24
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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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Filipe Da Silva de Sousa   

Western Sahara

     This is 1 of 259 approved meteorites from Western Sahara (plus 20 unapproved names)

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