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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
Classification
  history:
Recommended:  CR2    [explanation]

This is 1 of 176 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 6 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13880 (NWA 13880)

Algeria

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:
  MB110
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2021
Mass (g):525
Pieces:2
Class:CR2
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
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1140 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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