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Northwest Africa 13940
Basic information Name: Northwest Africa 13940
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13940
Observed fall: No
Year found: 2021
Country: Morocco
Mass:help 3.45 kg
Recommended:  Eucrite    [explanation]

This is 1 of 562 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 May 2021
Writeup from MB 110:

Northwest Africa 13940 (NWA 13940)


Purchased: 2021

Classification: HED achondrite (Eucrite)

History: (C. Muñecas, Expometeoritos) A batch consisting of more than 24 pieces of various sizes was found by a nomad in a place in northwest Africa of unknown coordinates. These meteorites were eventually purchased by Carlos Muñecas in Errachidia. Meteorites have different sizes ranging from a few grams to the main mass of 341 g.

Physical characteristics: Samples are almost entirely covered by a dark gray, wind-blown, contraction cracked fusion crust. Interior is light gray in color and dark colored clasts occurring in an igneous-textured matrix.

Petrography: Description and classification (A. Love, App) Sample is a breccia composed of sub-rounded to angular clasts of shock-melted and subophitic-textured lithologies (clasts show sharp boundaries). Subophitic textured clasts are fine-grained (avg. L.D. 285 µm) and are composed of aligned and radiating laths of plagioclase and exsolved pyroxenes. Shock-melted clasts are fine grained and show porphyritic and quench textures with skeletal and soda-straw morphologies. Sample is crosscut by a glassy shock melt vein. Additional minerals are: a silica polymorph, ilmenite, chromite, merrillite and troilite.

Geochemistry: (A. Love, App) low Ca pyroxene (Fs60.7±0.3Wo1.7±0.1, Fe/Mn=35.0±0.6, Mg#=38.2±0.4, n=12); pigeonite (Fs50.8Wo14.4, Fe/Mn=33.9, n=1); high Ca pyroxene (Fs29.0±5.1Wo39.7±5.8, Fe/Mn=34.5±1.0, n=12); plagioclase (An79.0±2.1Or2.2±0.8, n=8).

Classification: HED achondrite (monomict eucrite breccia M-S3 low weathering). Based on textures and mineral compositions, this sample is an HED breccia dominated by eucrite fragments.

Specimens: Carlos Muñecas holds the 341 g main mass. A polished thin section and an endcut and slice weighing 25.18 g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Errachidia
Date:P 2021
Mass (g):3450
Shock stage:M-S3
Weathering grade:low
Ferrosilite (mol%):60.7±0.3; 29.0±5.1
Wollastonite (mol%):1.7±0.1; 39.7±5.8
Magnetic suscept.:2.61
Classifier:A. Love
Type spec mass (g):25.2
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. 110, in preparation (2021)
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     This is 1 of 1894 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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