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Northwest Africa 7428
Basic information Name: Northwest Africa 7428
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7428
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 1830 g
Meteoritical Bulletin:  MB 101  (2012)  L6-melt breccia
Recommended:  L6-melt breccia    [explanation]

This is 1 of 70 approved meteorites classified as L6-melt breccia.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 4 Oct 2012
Writeup from MB 101:

Northwest Africa 7428 (NWA 7428)


Purchased: 2012

Classification: Ordinary chondrite (L6, melt breccia)

History: Purchased by Matt Morgan in Tucson 2012.

Physical characteristics: Single stone, dark, shiny, fusion-crusted exterior, some vesicles, moderate desert oxidation. Saw cut shows dark-colored melt vein up to 5 cm wide containing numerous partially melted, oval shaped, chondrite clasts. Veins bounded by light brown chondrite lithology. Fine grained metal grains evenly distributed throughout the sample.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows two main lithologies: 1) melt zones clogged with numerous rafted and partially melted PO and POP chondrules and chondrite matrix clasts, and suspended fine troilite blebs; 2) an unmelted, equilibrated, protogranular chondrite texture, with olivine, pyroxene, plagioclase, kamacite, troilite, and chromite; no distinct chondrules observed in the unmelted lithology.

Geochemistry: (C. Agee and M. Spilde, UNM) EMPA. Olivine Fa25.2±0.3, Fe/Mn=50±2, n=10; orthopyroxene Fs21.5±0.2Wo1.5±0.4, Fe/Mn=30±1, n=5; plagioclase Or12.2±0.3Ab72.4±0.1An15.4±0.4, n=2.

Classification: L6-melt breccia, weathering grade W2.

Specimens: 116 g including a probe mount on deposit at UNM. MtMorgan holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2012
Mass (g):1830
Class:L6-melt breccia
Weathering grade:W2
Fayalite (mol%):25.2±0.3
Ferrosilite (mol%):21.5±0.2
Wollastonite (mol%):1.5±0.4
Classifier:C. Agee, UNM
Type spec mass (g):116
Type spec location:UNM
Main mass:MtMorgan
Comments: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)
MtMorgan: Matt Morgan, Mile High Meteorites, P.O. Box 151293, Lakewood, CO 80215-9293, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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     This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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