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Northwest Africa 13946
Basic information Name: Northwest Africa 13946
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13946
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 575 g
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 6 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13946 (NWA 13946)

(Northwest Africa)

Purchased: 2021 Jan

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased from a meteorite dealer in Nouadhibou, Mauritania in January, 2021.

Physical characteristics: Two grayish fragments largely covered with fusion crust.

Petrography: Breccia composed of up to 1 mm sized mineral fragments and basaltic and black impact melt clasts up to 7 mm in size in fine-grained clastic matrix. Mineral phases are predominantly compositionally zoned low-Ca pyroxene, exsolved pyroxene, and calcic plagioclase grains. Minor phases include silica, chromite, ilmenite, troilite, and metallic iron.

Geochemistry: zoned low-Ca pyroxene: Fs35.5±9.4Wo3.3±0.7 (Fs23.1-45.2Wo2.4-5.3, FeO/MnO=26-33, n=15); low-Ca pyroxene host to augite exsolution lamellae: Fs48.3±1.2Wo3.1±1.3 (Fs46.9-50.3Wo1.8-5.8, FeO/MnO=25-29, n=19); Ca-pyroxene exsolution lamellae: Fs19.8±0.8Wo43.2±0.8 (Fs18.7-21.9Wo40.6-43.9, FeO/MnO=21-24, n=13); calcic plagioclase: An88.9±4.4 (An83.4-95.1, n=13)

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2021 Jan
Mass (g):575
Pieces:2
Class:Eucrite
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):35.5; 48.3; 19.8
Wollastonite (mol%):3.3; 3.1; 43.2
Classifier:A. Greshake, MNB
Type spec mass (g):24.5
Type spec location:MNB
Main mass:Salamu Ali
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. 110, in preparation (2021)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7752 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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