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Northwest Africa 15662
Basic information Name: Northwest Africa 15662
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15662
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 14 kg
Recommended:  LL3    [explanation]

This is 1 of 444 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 29 Jan 2023
Writeup from MB 112:

Northwest Africa 15662 (NWA 15662)

(Northwest Africa)

Purchased: 2022

Classification: Ordinary chondrite (LL3)

History: Purchased by Matthew Stream and Craig Zlimen from an Algerian meteorite dealer in 2022.

Physical characteristics: Forty matching stones, reddish brown weathered exterior, some pieces have patches of smooth fusion crust while others lack fusion crust entirely. Saw-cut surface reveals densely packed large chondrules some up to 4 mm in diameter.

Petrography: (C. Agee, UNM) Reflected light microscopy and electron microprobe examination of a polished mount shows numerous unequilibrated chondrules, many are porphyritic with glass or mesostasis. Some chondrules are decorated with troilite grains. Kamacite and taenite detected.

Geochemistry: (M. Spilde, UNM) Olivine Fa26.3±25.8, Fe/Mn=54±28, Cr2O3=0.13±0.12 wt%, n=12; low-Ca pyroxene Fs11.9±5.8Wo1.9±1.3, n=6.

Classification: Ordinary chondrite (LL3)

Specimens: 21 g on deposit at UNM, Craig Zlimen holds 10 kg and Matthew Stream holds 4 kg.

Data from:
  Table 0
  Line 0:
Date:P 2022
Mass (g):14000
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):26.3±25.8
Ferrosilite (mol%):11.9±5.8
Wollastonite (mol%):11.9±5.8
Classifier:C. Agee, UNM
Type spec mass (g):21
Type spec location:UNM
Main mass:Matthew Stream and Craig Zlimen
Comments:Fieldname MST-17; submitted by C. Agee
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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