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Northwest Africa 13945
Basic information Name: Northwest Africa 13945
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13945
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 1375 g
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 382 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 May 2021
Writeup from MB 110:

Northwest Africa 13945 (NWA 13945)

(Northwest Africa)

Purchased: March, 2021

Classification: HED achondrite (Eucrite, polymict)

History: The meteorite was purchased from a meteorite hunter in Nouadhibou, Mauritania in early March, 2021.

Physical characteristics: Seven dark grayish to brownish fragments without fusion crust.

Petrography: Polymict eucrite composed of up to 2.5 cm sized basaltic, gabbroic and impact melt clasts and up to 2 mm sized mineral fragments embedded in fine-grained clastic matrix. Mineral phases are predominantly diogenetic pyroxene (about 5 vol%), compositionally zoned low-Ca pyroxene, exsolved pyroxene, and calcic plagioclase grains. Minor phases include silica, chromite, ilmenite, troilite, and some olivine. No metallic iron was detected. Contains shock melt veins.

Geochemistry: diogenetic pyroxene: Fs27.4±0.2Wo2.5±0.1 (Fs27.2-27.8Wo2.3-2.7, FeO/MnO=24-28, n=10); zoned low-Ca pyroxene: Fs29.8±7.2Wo2.6±0.4 (Fs22.2-45.2Wo2.1-3.4, FeO/MnO=30-33, n=10); low-Ca pyroxene host to augite exsolution lamellae: Fs58.3±0.6Wo2.4±0.6 (Fs56.9-58.9Wo1.8-4.0, FeO/MnO=30-32, n=9); Ca-pyroxene exsolution lamellae: Fs25.0±1.6Wo44.0±0.7 (Fs23.7-28.0Wo43.1-45.1, FeO/MnO=23-33, n=12); olivine: Fa36.9±0.2, FeO/MnO=47±2, n=12; calcic plagioclase: An91.4±0.9 (An90.0-93.0, n=11)

Data from:
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P March, 2021
Mass (g):1375
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):36.9
Ferrosilite (mol%):27.4; 29.8; 58.3; 25.0
Wollastonite (mol%):2.5; 2.6; 2.4; 44.0
Classifier:A. Greshake, MNB
Type spec mass (g):52.2
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 Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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