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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:
Recommended:  LL7    [explanation]

This is 1 of 77 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 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 1133 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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