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Northwest Africa 15658
Basic information Name: Northwest Africa 15658
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15658
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 5.85 kg
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  Eucrite-melt breccia
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 100 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Feb 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15658 (NWA 15658)

(Northwest Africa)

Purchased: October, 2022

Classification: HED achondrite (Eucrite, melt breccia)

History: The meteorite was purchased from a meteorite dealer in Morocco.

Physical characteristics: Dark grayish rock with some fusion crust.

Petrography: Eucrite-melt breccia composed of up to 3 cm sized basaltic clasts and up to 500 µm sized mineral fragments in black shock melted matrix. Main minerals are exsolved pyroxenes and calcic plagioclase. The shock melt is mostly finely recrystallized and partly displays flow textures. 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: Fs62.5±0.6Wo2.6±0.8 (Fs61.3-63.6Wo1.9-4.6, FeO/MnO=27-30, n=10); high-Ca pyroxene: Fs27.6±0.7Wo43.6±0.7 (Fs26.3-28.7Wo42.2-44.9, FeO/MnO=27-32, n=10); calcic plagioclase: An87.1±1.0 (An85.4-88.9, n=10).

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P October, 2022
Mass (g):5845
Pieces:1
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):62.5; 27.6
Wollastonite (mol%):2.6; 43.6
Classifier:A. Greshake, MNB
Type spec mass (g):20
Type spec location:MNB
Main mass:David Göttlich
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 9570 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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