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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
Recommended:  Eucrite    [explanation]

This is 1 of 569 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 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:
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2021 Jan
Mass (g):575
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
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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