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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 8 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 166 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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