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Northwest Africa 15438
Basic information Name: Northwest Africa 15438
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15438
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 969 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 571 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15438 (NWA 15438)

Algeria

Find: 2021

Classification: HED achondrite (Eucrite)

History: Found in 2021 in Algeria, later purchased in September 2021 by Chris Monk from Younes Chaoui.

Physical characteristics: Many stones with dark-brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Specimen is comprised of mm-sized sub-angular lithic clasts (primarily diabasic and gabbroic clasts, some containing exsolved augite) and monomineralic clasts set within a fine-grained matrix containing accessory Cr-spinel, ilmenite, and SiO2-rich glass.

Geochemistry: Low-Ca Pyroxene (Fs60.9±2.7Wo3.8±0.4, range Fs58.9-62.8Wo3.5-4.1, Fe/Mn=30±1, n=2), Pigeonite (Fs55.2±1.3Wo8.0±1.4, range Fs53.7-57.4Wo5.6-9.6, Fe/Mn=30±1, n=12), High-Ca Pyroxene (Fs31.0±0.9Wo37.4±0.9, range Fs29.5-32.4Wo35.6-38.8, Fe/Mn=30±2, n=11), Calcic Plagioclase (An89.2±2.3, range An83.8-93.0, n=16).

Classification: Achondrite (Eucrite).

Specimens: 20.3 grams at Cascadia, main mass with Chris Monk.

Data from:
  MB111
  Table 0
  Line 0:
Date:2021
Mass (g):969
Pieces:many
Class:Eucrite
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):60.9±2.7, 55.2±1.3, 31.0±0.9
Wollastonite (mol%):3.8±0.4, 8.0±1.4, 37.4±0.9
Classifier:D. Sheikh, Cascadia
Type spec mass (g):20.3
Type spec location:Cascadia
Main mass:Chris Monk
Comments:CML 1570; submitted by Daniel Sheikh
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1270 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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