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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:
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 Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1270 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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