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Northwest Africa 13880
Basic information Name: Northwest Africa 13880
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13880
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 525 g
Recommended:  CR2    [explanation]

This is 1 of 183 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 6 May 2021
Writeup from MB 110:

Northwest Africa 13880 (NWA 13880)


Purchased: 2021

Classification: Carbonaceous chondrite (CR2)

History: (C. Muñecas, Expometeoritos) Two pieces were found by a nomad in a place in northwest Africa of unknown coordinates. These meteorites were eventually purchased by Carlos Muñecas from a dealer in Tindouf.

Physical characteristics: Samples are tabular to irregular in shape and have a dark brownish orange exterior. A cut face shows the interior is composed of metal decorated chondrules and matrix containing rounded metal nodules up to 1mm.

Petrography: Description and classification (A. Love, App) Sample shows a chondritic texture composed of well-defined chondrules (avg. dia. 948 µm, n=50) containing: isotropic glass, altered mesostasis, and igneous rims. These components are set within an opaque matrix (~41 vol%) containing abundant AOAs, sparse CAIs. Rounded FeNi metal accounts for ~5 vol% of sample. Additional minerals are: anorthitic and intermediate plagioclase, chromite, rare troilite, pentlandite and apatite.

Geochemistry: Olivine (type I: Fa2.8±1.9, Cr2O3=0.5±0.1, Fe/Mn=16.2±11.0, n=15, type II: Fa31.3±8.8, Fe/Mn=57.2±10.7, n=5), low Ca pyroxene (Fs3.8±2.8Wo1.6±1.5, Fe/Mn=13.9±11.3, n=10); diopside (Fs2.8±1.4Wo49.9±0.9, n=3). Matrix with low analytical totals (82.4±2.2wt%, n=10).

Classification: Carbonaceous chondrite (CR2). Metal decorated chondrules, hydrated matrix, Fe/Mn of type IIA chondrules, rare CAIs suggest this sample is a CR2.

Specimens: C. Muñecas (Expometeoritos) holds the 411 g main mass. A polished thin section, mount and 3 fragments weighing a total of 24.13 g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2021
Mass (g):525
Shock stage:C-S2
Weathering grade:W2
Fayalite (mol%):2.8±1.9
Ferrosilite (mol%):3.8±2.8
Wollastonite (mol%):1.6±1.5
Magnetic suscept.:4.93
Classifier:A. Love, App
Type spec mass (g):24.13
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 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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