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Northwest Africa 15797
Basic information Name: Northwest Africa 15797
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15797
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 610 g
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 75 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 4 Mar 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15797 (NWA 15797)

(Northwest Africa)

Purchased: Jan 2023

Classification: HED achondrite (Eucrite, melt breccia)

History: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania in January, 2023.

Physical characteristics: Dark brownish rock with minor fusion crust.

Petrography: Achondritic melt breccia composed of up to 7 mm sized rounded to subrounded basaltic clasts set in abundant recrystallized shock melt. Predominant minerals are up to 1 mm sized exsolved pyroxenes and calcic plagioclase. Mineral grains entrained in the melt matrix often show resorption textures. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron detected.

Geochemistry: low-Ca pyroxene: Fs64.1±0.4Wo2.2±0.1 (Fs63.5-64.8Wo2.1-2.3, FeO/MnO=27-30, n=10); augite exsolution lamellae: Fs25.2±0.2Wo44.1±0.3 (Fs24.8-25.4Wo43.6-44.5, FeO/MnO=27-30, n=10); calcic plagioclase: An89.3±1.4 (An86.4-91.5, n=10)

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P Jan 2023
Mass (g):610
Pieces:1
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):64.1; 25.2
Wollastonite (mol%):2.2; 44.1
Classifier:A. Greshake, MNB
Type spec mass (g):102
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. 112, in preparation (2023)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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