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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 589 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 2003 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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