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Northwest Africa 13741
Basic information Name: Northwest Africa 13741
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13741
Observed fall: No
Year found: 2020
Country: Mauritania
Mass:help 257 g
Recommended:  LL3-5    [explanation]

This is 1 of 10 approved meteorites classified as LL3-5.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 13 Feb 2021
Writeup from MB 110:

Northwest Africa 13741 (NWA 13741)


Purchased: 2020

Classification: Ordinary chondrite (LL3-5)

History: Ten samples weighing a total of 256.8 g were found and subsequently purchased by John Higgins in November of 2020.

Physical characteristics: Some samples are partially covered by a wind-ablated, weathered, dark brown fusion crust (one showing orientation). The cut face is light gray and shows abundant chondrules, sparse clasts and un-weathered metal and sulfide grains.

Petrography: Description and classification (A. Love, App) Sample is a chondrite breccia composed of clasts of: equilibrated chondrite and impact melt set within a host of unequilibrated chondrules, fragments and clastic matrix. Host chondrules (avg. dia. 793 µm, n= 65) contain isotropic glass, abundant clinoenstatite and sulfide rims. Type 5 Clasts are recrystallized with barely discernible chondrules (avg diameter 864µm, n=27), rare clinoenstatite and secondary plagioclase with an avg. grainsize 50µm, n=24). Additional minerals are: high Ca pyroxene, FeNi metals, troilite, chromite (Ti-bearing) and apatite.

Geochemistry: Host: Olivine (Fa18.3±15.6 (range Fa0.6-45.5), Fe/Mn=59.1±32.6, n=14); low Ca pyroxene (Fs13.9±11.8Wo0.9±0.7, Fe/Mn=20.3±9.3, n=9). Clasts: Olivine (Fa29.5±0.8, Fe/Mn=53.9±2.6, n=10); low Ca Pyroxene (Fs24.3±1.6Wo2.0±0.9, Fe/Mn=37.2±0.1 n=10).

Classification: Ordinary chondrite (LL3-5, C-S3, W1) Chondrule diameter, magnetic susceptibility and mineral compositions indicate LL. Unequilibrated host (type 3), and recrystallized clasts with poorly equilibrated pyroxenes and rare clinoenstatite suggesting type 5.

Specimens: John Higgins holds the main masses. 3 fragments weighing a total of 24.53 g and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Date:P 2020
Mass (g):256.8
Shock stage:C-S3
Weathering grade:W1
Fayalite (mol%):18.3±15.6; 29.5±0.8
Ferrosilite (mol%):13.9±11.8
Wollastonite (mol%):0.9±0.7
Magnetic suscept.:4.29
Classifier:A. Love, App
Type spec mass (g):24.53
Type spec location:App
Main mass:John Higgins
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 195 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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