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Northwest Africa 15640
Basic information Name: Northwest Africa 15640
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15640
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 1050 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2024)  L/LL5
Recommended:  L/LL5    [explanation]

This is 1 of 19 approved meteorites classified as L/LL5.   [show all]
Search for other: L chondrites, L/LL chondrites, L/LL chondrites (type 4-7), LL chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 29 Jan 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15640 (NWA 15640)

Algeria

Find: April 2021

Classification: Ordinary chondrite (L/LL5)

History: Purchased by Youssef Benani from Salek Zeini in Tindouf, Algeria.

Physical characteristics: Single stone with dark brown fusion crust.

Petrography: (D. Sheikh, Cascadia; A. Love, App) Specimen is an equilibrated chondrite containing secondary recrystallized feldspar (Av. ~43 μm, n=50) and accessory Fe-Ni metal, troilite, chromite, and merrillite.

Geochemistry: (A. Love, App) Olivine (Fa27.0±0.4, n=12), Low-Ca Pyroxene (Fs21.6±0.4Wo1.3±0.2, n=12).

Classification: Ordinary Chondrite (L/LL5).

Specimens: 21.4 g at Cascadia, main mass with Youssef Benani.

Data from:
  MB112
  Table 0
  Line 0:
Date:April 2021
Mass (g):1050
Pieces:1
Class:L/LL5
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):27.0±0.4
Ferrosilite (mol%):21.6±0.4
Wollastonite (mol%):1.3±0.2
Classifier:D. Sheikh, Cascadia; A. Love, App
Type spec mass (g):21.4
Type spec location:Cascadia
Main mass:Youssef Benani
Comments:CML 1560; 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)
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
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. ?
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1374 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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