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Northwest Africa 13771
Basic information Name: Northwest Africa 13771
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13771
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 121.4 g
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 48 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Mar 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13771 (NWA 13771)

(Northwest Africa)

Purchased: 2020

Classification: HED achondrite (Eucrite, melt breccia)

History: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania, in late 2020.

Physical characteristics: Two dark grayish fragments without fusion crust.

Petrography: Eucrite-melt breccia composed of up to 1.7 mm sized mineral fragments set into abundant shock melted matrix. Predominant minerals are exsolved pyroxenes and calcic plagioclase. The fine-grained shock melt is mostly recrystallized and mineral grains in contact with the melt are partly resorbed. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron has been detected. Contains secondary calcite and barite.

Geochemistry: low-Ca pyroxene: Fs34.0±1.3Wo2.2±0.1 (Fs32.5-35.5Wo2.0-2.3, n=12, FeO/MnO=25-29); Ca-pyroxene: Fs13.0±0.4Wo44.4±0.7 (Fs12.5-13.8Wo43.1-45.2, n=10, FeO/MnO=18-25); calcic plagioclase: An93.9±0.5 (An93.1-94.6, n=12)

Classification: Eucrite-melt breccia

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2020
Mass (g):121.4
Pieces:2
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):34.0; 13.0
Wollastonite (mol%):2.2; 44.4
Classifier:A. Greshake, MNB
Type spec mass (g):23.4
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 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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