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Northwest Africa 13906
Basic information Name: Northwest Africa 13906
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13906
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 1500 g
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  L4
Recommended:  L4    [explanation]

This is 1 of 2062 approved meteorites (plus 5 unapproved names) classified as L4.   [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
Writeuphelp
Writeup from MB 110:

Northwest Africa 13906 (NWA 13906)

Algeria

Purchased: 2018

Classification: Ordinary chondrite (L4)

History: Purchased in 2019.

Physical characteristics: Twenty identically appearing stones found together, no fusion crust. Saw-cut surface reveals a brecciated chondrite with clasts that have different matrix colors, one being distinctly lighter and the other darker. Numerous, tightly packed, distinct chondrules are present throughout.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows porphyritic chondrules, many with mesostasis or glass. Most secondary plagioclase grains are less than 2 μm in size. Diopsidic pyroxene detected, troilite and Fe,Ni-metal are ubiquitous.

Geochemistry: (C. Agee, UNM) Olivine Fa25.1±2.2, Fe/Mn=49±6, n=8; low-Ca pyroxene Fs19.8±3.4Wo1.7±1.0, Fe/Mn=30±5, n=5.

Classification: Ordinary chondrite L4 (breccia)

Specimens: 21.4 g on deposit at UNM, Matthew Stream holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018
Mass (g):1500
Pieces:20
Class:L4
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):25.1±2.2
Ferrosilite (mol%):19.8±3.4
Wollastonite (mol%):1.7±1.0
Classifier:C. Agee, UNM
Type spec mass (g):21.4
Type spec location:UNM
Main mass:Matthew Stream
Comments:Field name MST-4; submitted by C. Agee, UNM
Institutions
   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)
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 1356 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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