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Northwest Africa 13905
Basic information Name: Northwest Africa 13905
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13905
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 2.2 kg
Recommended:  L6    [explanation]

This is 1 of 11725 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 10 Apr 2021
Writeup from MB 110:

Northwest Africa 13905 (NWA 13905)

(Northwest Africa)

Purchased: 2020

Classification: Ordinary chondrite (L6)

History: Purchased from Mostafa Hnini in December 2020.

Physical characteristics: Twenty identically appearing stones found together. All stones have smooth sand blasted exterior surfaces. Saw-cut surfaces reveal light brown and gray grains, a few distinct chondrules, all of which are set in a dark gray groundmass. Distinct shock melt veins are clearly visible in polished cut-faces.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a few porphyritic and barred chondrules, the groundmass consists of recrystallized silicates, Fe,Ni-metal, and troilite. Plagioclase grains are up to ~200 μm in size.

Geochemistry: (C. Agee, UNM) Olivine Fa24.1±0.3, Fe/Mn=47±2, n=8; low-Ca pyroxene Fs20.1±0.2Wo1.7±0.2, Fe/Mn=28±1, n=6.

Classification: Ordinary chondrite L6

Specimens: 70.85 g on deposit at UNM, Matthew Stream holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2020
Mass (g):2.2 kg
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):24.1±0.3
Ferrosilite (mol%):20.1±0.2
Wollastonite (mol%):1.7±0.2
Classifier:C. Agee, UNM
Type spec mass (g):70.85
Type spec location:UNM
Main mass:Matthew Stream
Comments:Field name MST-3; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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