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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
Meteoritical Bulletin:  MB 112  (2024)  Howardite
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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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