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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:
Meteoritical Bulletin:  MB 111  (2023)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 606 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1374 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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