Meteoritical Bulletin: Entry for Northwest Africa 13946

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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: 575 g

Classification
history:

Recommended:

Eucrite [explanation]

This is 1 of 554 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 6 May 2021

Writeup

help

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: Fs_35.5±9.4Wo_3.3±0.7(Fs_23.1-45.2Wo_2.4-5.3, FeO/MnO=26-33, n=15); low-Ca pyroxene host to augite exsolution lamellae: Fs_48.3±1.2Wo_3.1±1.3(Fs_46.9-50.3Wo_1.8-5.8, FeO/MnO=25-29, n=19); Ca-pyroxene exsolution lamellae: Fs_19.8±0.8Wo_43.2±0.8(Fs_18.7-21.9Wo_40.6-43.9, FeO/MnO=21-24, n=13); calcic plagioclase: An_88.9±4.4(An_83.4-95.1, 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)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8402 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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