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Northwest Africa 16404
Basic information Name: Northwest Africa 16404
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16404
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 330 g
Classification
  history:
Recommended:  L6    [explanation]

This is 1 of 12995 approved meteorites (plus 11 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 10 Jan 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16404 (NWA 16404)

(Northwest Africa)

Purchased: 2022 June

Classification: Ordinary chondrite (L6)

History: Mr. Jasper Spencer purchased three pieces from a Mauritanian dealer in June 2022 via FB Messenger. The dealer told Mr. Spencer that the meteorite had been found in Morocco in 2022. End cuts from two of the three stones, weighing 35.0 and 22.7 g) were sent to Cascadia.

Physical characteristics: Physical Characteristics: The exterior of one end cut is entirely covered with dark brown to black fusion crust. The exterior of the other end cut contains a thin strip of similar fusion crust adjacent to a broken surface that is pale to dark orange. Cut faces for both pieces are medium orange-brown and with color variations indicating poorly defined chondrules.

Petrography: (M. Hutson, D. Pierce A. Ruzicka, Cascadia): Two sides of the thin section have fusion crust which varies from approximately 0.2 to 0.6 mm in thickness. Silicates are coarse-grained, with only a few discernable chondrules. Plagioclase feldspar is coarse, with numerous grains up to 100 microns across.

Geochemistry: Olivine Fa25.2±0.2 (N=21); low-Ca pyroxene Fs21.3±0.2Wo1.4±0.1 (N=16); high-Ca pyroxene Fs8.2±0.2Wo44.9±0.6 (N=4); plagioclase feldspar Ab83.4±0.8An10.6±0.1Or6.0±0.8 (N=12).

Classification: Ordinary chondrite (L6) based on mineral chemistry, texture, and coarse feldspar size.

Specimens: Cascadia holds 53.9 g in two pieces, as well as a polished thin section and material in an epoxy butt; Mr. Jasper Spencer holds the main mass.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:FB Messenger
Date:P 2022 June
Mass (g):330
Pieces:3
Class:L6
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):25.2±0.2, N=21
Ferrosilite (mol%):21.3±0.2, N=16
Wollastonite (mol%):1.4±0.1, N=16
Classifier:M. Hutson, D. Pierce, and A. Ruzicka, Cascadia
Type spec mass (g):57.7
Type spec location:Cascadia
Main mass:Mr. Jasper Spencer
Comments:Lab number CML 1672; 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 Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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