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Northwest Africa 13549
Basic information Name: Northwest Africa 13549
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13549
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 25 g
Classification
  history:
Meteoritical Bulletin:  MB 109  (2020)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 12 Dec 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13549 (NWA 13549)

(Northwest Africa)

Purchased: 2020

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased from a dealer in Morocco.

Physical characteristics: Dark-grayish fragment with some fusion crust.

Petrography: The meteorite is an unbrecciated basalt composed of fine- and coarse-grained regions dominated by exsolved pyroxenes and often lath-shaped calcic plagioclase. Grain sizes vary from about 80 to 500 µm for pyroxene and about 50 to 700 µm for plagioclase. Minor phases include silica, chromite, ilmenite, and FeS; no metallic iron has been detected.

Geochemistry: low-Ca pyroxene: Fs55.2±0.4Wo7.9±0.5 (Fs54.6-56.0Wo7.1-8.8, n=11, FeO/MnO=28-30); Ca-pyroxene: Fs29.7±1.0Wo40.1±1.4 (Fs27.8-31.3Wo38.3-43.1, n=11, FeO/MnO=26-29); calcic plagioclase: An84.5±1.4 (An81.5-85.7, n=12)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):25
Pieces:1
Class:Eucrite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):55.2; 29.7
Wollastonite (mol%):7.9; 40.1
Classifier:A. Greshake, MNB
Type spec mass (g):5.1
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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