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Northwest Africa 14557
Basic information Name: Northwest Africa 14557
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14557
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 22 g
Classification
  history:
Recommended:  L5    [explanation]

This is 1 of 8504 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 22 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14557 (NWA 14557)

(Northwest Africa)

Purchased: 2020

Classification: Ordinary chondrite (L5)

History: Acquired in 2020 by D. Sheikh from a meteorite dealer in Morocco.

Physical characteristics: Single stone slice containing a dark-brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is an equilibrated ordinary chondrite containing secondary recrystallized plagioclase (~25 µm) and accessory Fe-Ni metal, troilite and chromite.

Geochemistry: Olivine (Fa25.3±0.9, range Fa23.8-26.8, n=12), Low-Ca Pyroxene (Fs21.0±0.9Wo1.2±0.2, range Fs20.2-22.5Wo0.9-1.5, n=11).

Classification: Ordinary Chondrite (L5)

Specimens: 22 g at Cascadia, main mass with Cascadia

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):22
Pieces:1
Class:L5
Shock stage:S4
Weathering grade:W3
Fayalite (mol%):25.3±0.9
Ferrosilite (mol%):21.0±0.9
Wollastonite (mol%):1.2±0.2
Classifier:D. Sheikh, Cascadia
Type spec mass (g):22
Type spec location:Cascadia
Main mass:Cascadia
Comments:Submitted by Daniel Sheikh
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., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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