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Northwest Africa 13109
Basic information Name: Northwest Africa 13109
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13109
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 286 g
Classification
  history:
Recommended:  L4    [explanation]

This is 1 of 1709 approved meteorites (plus 24 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 Jan 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13109 (NWA 13109)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L4)

History: Purchased by an anonymous collector from a dealer at the Munich Show in 2005, subsequently acquired by the Hollis Collection and then donated to PSF.

Petrography: (A. Irving, UWS & J. Boesenberg, BrownU) Well-formed chondrules occur in a recrystallized matrix containing altered metal. Opaque veinlets of secondary goethite are also present in this fairly weathered specimen.

Geochemistry: Olivine (Fa25.1±1.3 (range Fa24.2-27.5, N = 7), low-Ca pyroxene (Fs20.9±0.4Wo2.3±0.4 (range Fs20.6-21.4Wo1.8-1.4, N = 4).

Classification: Ordinary chondrite (L4).

Specimens: The entire specimen including one polished thin section is at PSF.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2005
Mass (g):286
Pieces:1
Class:L4
Shock stage:S2
Weathering grade:W2/3
Fayalite (mol%):25.1±1.3
Ferrosilite (mol%):20.9±0.4
Wollastonite (mol%):1.6±0.2
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):286
Type spec location:PSF
Main mass:PSF
Comments:Work name CHC18044; submitted by A. Irving
Institutions
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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