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Northwest Africa 13941
Basic information Name: Northwest Africa 13941
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13941
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 1695 g
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  LL7
Recommended:  LL7    [explanation]

This is 1 of 99 approved meteorites classified as LL7.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 29 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13941 (NWA 13941)

Algeria

Purchased: 2021

Classification: Ordinary chondrite (LL7)

History: (C. Muñecas, Expometeoritos) A batch consisting 3 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 from a dealer in Tindouf.

Physical characteristics: Samples are coated with a dark brown, wind ablated fusion crust. A cut face shows the interior is dark orangish brown and has a brecciated texture.

Petrography: Description and classification (A. Love, App) Sample is a cataclastic breccia composed of rounded to angular clasts of texturally equilibrated chondritic debris set within a comminuted matrix of similar materials. Chondrules were not observed in thin section. Average clast size is 1466 µm. Average grainsize of secondary plagioclase is 122 µm, (n=22). Sample contains (<1vol%) angular up to 460 µm clasts of K-feldspar (2V of optical figures indicates this is microcline) grains within the comminuted matrix. Sample shows abundant poikilitic textured fragments. Additional minerals are: high Ca pyroxene, albitic plagioclase, apatite, chromite and troilite.

Geochemistry: (A. Love, App) Olivine (Fa31.3±0.4, Fe/Mn=63.3±2.2, n=13); low Ca pyroxene (Fs26.4±0.7Wo2.4±0.6, Fe/Mn=38.4±1.1, n=13); high Ca Pyroxene (Fs11.6±1.2Wo43.1±1.1, n=7); plagioclase (Ab81.6±2.0Or4.3±0.7, n=4); alkali feldspar (Or90.0±6.4Ab6.8±5.3, n=10).

Classification: Ordinary chondrite (LL7 breccia, C-S3, W3). Equilibrated textures, grainsize of secondary plagioclase, presence of alkali feldspar and mineral compositions indicate sample is an LL7 ordinary chondrite.

Specimens: C. Muñecas (Expometeoritos) holds the 1015 g main mass. A polished thin section and 3 slices weighing 24.99 g are on deposit at App.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2021
Mass (g):1695
Pieces:3
Class:LL7
Shock stage:C-S3
Weathering grade:W3
Fayalite (mol%):31.3±0.4
Ferrosilite (mol%):26.4±0.7; 11.6±1.2
Wollastonite (mol%):2.4±0.6; 43.1±1.1
Magnetic suscept.:3.29
Classifier:Anthony Love
Type spec mass (g):24.99
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 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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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1344 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)
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Revision
  history:
  This lists important revisions made to data for this record.

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