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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
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  L6
Recommended:  L6    [explanation]

This is 1 of 12727 approved meteorites (plus 11 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
Writeuphelp
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:
  MB110
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2020
Mass (g):2.2 kg
Pieces:20
Class:L6
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
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: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names)
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Revision
  history:
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