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Northwest Africa 13457
Basic information Name: Northwest Africa 13457
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13457
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 11.78 kg
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 502 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 28 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13457 (NWA 13457)

(Northwest Africa)

Purchased: June, 2020

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased from a local meteorite dealer in Algeria.

Physical characteristics: Light-brownish rock without fusion crust.

Petrography: The meteorite is an unbrecciated coarse-grained achondrite of dominantly up to 1 mm sized exsolved pyroxene and calcic plagioclase grains. Low-Ca pyroxene contains both, sub-micrometer sized and up to 200 µm wide augite exsolution lamellae. Minor phases are silica, chromite, FeS, and FeNi metal.

Geochemistry: low-Ca pyroxene: Fs52.0±0.6Wo7.1±0.7 (Fs51.3-53.1Wo6.2-8.1, n=12, FeO/MnO=27-29); Ca-pyroxene: Fs26.2±0.2Wo40.8±0.1 (Fs25.9-26.5Wo40.6-41.0, n=13, FeO/MnO=24-29); calcic plagioclase: An92.1±0.6 (An91.0-93.1, n=13); Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave: δ18O=3.657, 4.125, 3.787; δ17O=1.655, 1.875, 1.717; Δ17O= -0.276, -0.303, -0.283 (all per mil)

Classification: Achondrite (eucrite).

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P June, 2020
Mass (g):11780
Pieces:1
Class:Eucrite
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):52.0; 26.2
Wollastonite (mol%):7.1; 40.8
Magnetic suscept.:2.74
Classifier:A. Greshake, MNB
Type spec mass (g):20.3
Type spec location:MNB
Main mass:Said Yousfi
Comments:Submitted by Ansgar Greshake
Plots: O isotopes:  
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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 Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7741 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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