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Northwest Africa 15435
Basic information Name: Northwest Africa 15435
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15435
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 328 g
Recommended:  Howardite    [explanation]

This is 1 of 453 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 29 Jan 2023
Writeup from MB 112:

Northwest Africa 15435 (NWA 15435)

(Northwest Africa)

Purchased: 9 Sep 2021

Classification: HED achondrite (Howardite)

History: Purchased on 9 Sept 2021 by Chris Monk from Younes Chaoui.

Physical characteristics: Single stone with dark-brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is brecciated and is composed primarily of mm-cm-sized sub-angular to sub-rounded lithic clasts (proportions roughly ~60% diogenitic and ~40% eucritic lithologies) and monomineralic clasts set within a finer-grained, fragmental matrix. Accessory phases include Cr-spinel, ilmenite, SiO2-rich glass, and troilite.

Geochemistry: Diogenite Clasts [Olivine (Fa27.0±1.1, range Fa25.4-28.1, Fe/Mn=46±3, n=5), Low-Ca Pyroxene (Fs27.5±5.0Wo2.8±1.0, range Fs21.7-37.9Wo1.4-5.3, Fe/Mn=30±3, n=40)]; Eucrite Clasts [Olivine (Fa35.4±3.0, range Fa33.7-41.8, Fe/Mn=53±5, n=7), Low-Ca Pyroxene (Fs51.7±7.5Wo3.2±1.4, range Fs43.1-59.4Wo1.6-5.4, Fe/Mn=29±2, n=6), Pigeonite (Fs46.5±8.9Wo9.1±5.5, range Fs30.0-57.0Wo5.9-22.2, Fe/Mn=29±3, n=8), High-Ca Pyroxene (Fs 22.1±3.2Wo40.7±1.7, range Fs19.2-25.5Wo38.9-42.2, Fe/Mn=25±2, n=3), Calcic Plagioclase (An91.9±2.7, range An84.1-94.6, n=26)].

Classification: Achondrite (Howardite).

Specimens: 21.7 g at Cascadia, main mass with Chris Monk.

Data from:
  Table 0
  Line 0:
Place of purchase:Northwest Africa
Date:P 9 Sep 2021
Mass (g):328
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):27.0±1.1, 35.4±3.0
Ferrosilite (mol%):27.5±5.0, 51.7±7.5, 46.5±8.9, 22.1±3.2
Wollastonite (mol%):2.8±1.0, 3.2±1.4, 9.1±5.5, 40.7±1.7
Classifier:D. Sheikh, Cascadia
Type spec mass (g):21.7
Type spec location:Cascadia
Main mass:Chris Monk
Comments:CML 1587; submitted by Daniel Sheikh
   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)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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