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Northwest Africa 15441
Basic information Name: Northwest Africa 15441
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15441
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 203 g
Recommended:  LL3    [explanation]

This is 1 of 469 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 12 Nov 2022
Writeup from MB 111:

Northwest Africa 15441 (NWA 15441)

(Northwest Africa)

Purchased: Aug 2020

Classification: Ordinary chondrite (LL3)

History: Two stones (132 and 71 g) were purchased by Mr. Jasper Spencer from a Moroccan dealer in August 2020 via Facebook Messenger.

Petrography: (M. Hutson, A. Ruzicka, Cascadia): Two thin sections were prepared and examined. In thin section, the sample is composed of crisply-defined chondrules, partial chondrules and lithic fragments set in a fragmental matrix. The apparent mean chondrule diameter is 0.9 mm (N=13). Weathering is variable, ranging from about 40% replacement on one side of one thin section to complete replacement on the other side; the second section is more uniform with about 60% replacement, putting this stone at the W2/W3 boundary. Metal abundance (including associated iron hydroxide produced by weathering) in thin section comprises ~2 area%.

Geochemistry: Olivine is unequilibrated with Fa4.8-40.5, average Fa31.6±9.6, N=42. Low-Ca pyroxene is unequilibrated with Fs0.7-30.0; average Fs15.3±8.4Wo1.3±1.1, N=44.

Classification: Ordinary chondrite (LL3) based on chemistry, texture, average chondrule size, and metal/troilite abundance.

Specimens: Cascadia holds 26.3 g in one piece, as well as two polished thin sections and material in two epoxy butts; Mr. Jasper Spencer holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P Aug 2020
Mass (g):203
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):31.6±9.6 (N=42)
Ferrosilite (mol%):15.3±8.4 (N=44)
Wollastonite (mol%):1.3±1.1 (N=44)
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):32.3
Type spec location:Cascadia
Main mass:Mr. Jasper Spencer
Comments:Lab number CML 1439; submitted by Melinda Hutson
   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. 111, in preparation (2022)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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