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Northwest Africa 14457
Basic information Name: Northwest Africa 14457
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14457
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 3.56 kg
Recommended:  L4/5-melt breccia    [explanation]

This is the only approved meteorite classified as L4/5-melt breccia.
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 20 Dec 2021
Writeup from MB 110:

Northwest Africa 14457 (NWA 14457)

(Northwest Africa)

Purchased: 2020

Classification: L4/5-melt breccia

History: Purchased by Jiachang Yu in 2020 from a Moroccan dealer at the China Mineral and Gem Show in Beijing City.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen consists of about equal proportions of shock-darkened lithic chondrite clasts and dark (almost opaque), very fine grained quenched melt rock matrix. Some well-formed equilibrated chondrules are present in lithic clasts and these are set within matrices containing stained kamacite, taenite, troilite, sodic plagioclase, medium-Ti chromite, merrillite and chlorapatite. Clasts have shock stage S4.

Geochemistry: Olivine (Fa23.7±0.3, range Fa23.4-24.2, N = 6), low-Ca pyroxene (Fs19.9±0.2Wo1.3±0.2, range Fs19.6-20.1Wo1.1-1.5, N = 5), augite (Fs7.0±0.2Wo47.2±1.2, range Fs6.8-7.1Wo46.3-48.0, N = 2), plagioclase (Ab78.6-84.1An13.7-10.0Or7.7-5.9, N = 2).

Classification: Ordinary chondrite (L4/5 melt breccia).

Specimens: 39 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  Table 0
  Line 0:
Place of purchase:Beijing City, China
Date:P 2020
Mass (g):3558
Class:L4/5-melt breccia
Weathering grade:W1
Fayalite (mol%):23.7±0.3
Ferrosilite (mol%):19.9±0.2
Wollastonite (mol%):1.3±0.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):39
Type spec location:UWB
Main mass:J. Yu and WangZ
Comments:Work name WZY-56; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Beijing: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China (institutional address; updated 16 Oct 2011)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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     This is 1 of 8420 approved meteorites from (Northwest Africa) (plus 1900 unapproved names)

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