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Northwest Africa 13471
Basic information Name: Northwest Africa 13471
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13471
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 100 g
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 65 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Nov 2020
Writeup from MB 109:

Northwest Africa 13471 (NWA 13471)

(Northwest Africa)

Purchased: Sept 2020

Classification: HED achondrite (Eucrite, melt breccia)

History: The meteorite was bought by the main mass holder from a local meteorite dealer in Mauretania.

Physical characteristics: Dark-grayish rock without fusion crust.

Petrography: The meteorite is a melt breccia predominantly composed of large up to 1 cm sized basaltic and mineral clasts embedded into a recrystallized shock melt matrix. Exsolved pyroxene and calcic plagioclase are the dominant mineral phases. Minerals surrounded by melt show resorbtion features, are partly to completely recrystallized and often display mottled compositional zoning. In recrystallized regions feldspar often shows fibrous textures indicative for crystallization from a melt. Minor phases include silica, FeS, chromite, and ilmenite. No metallic iron has been found.

Geochemistry: low-Ca pyroxene: Fs61.5±1.6Wo2.7±0.6 (Fs60.5-65.6Wo1.9-3.7, n=14, FeO/MnO=26-29); Ca-pyroxene: Fs25.8±2.5Wo43.8±0.7 (Fs23.4-32.6Wo42.1-44.6, n=16, FeO/MnO=25-31); calcic plagioclase: An89.5±0.8 (An87.9-91.0, n=14)

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P Sept 2020
Mass (g):100
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):61.5; 25.8
Wollastonite (mol%):2.7; 43.8
Classifier:A. Greshake, MNB
Type spec mass (g):20.8
Type spec location:MNB
Main mass:Lucian Cojocaru
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. 109, in preparation (2020)
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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