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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
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  LL3
Recommended:  LL3    [explanation]

This is 1 of 509 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
Writeuphelp
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:
  MB111
  Table 0
  Line 0:
Date:P Aug 2020
Mass (g):203
Pieces:2
Class:LL3
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
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: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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