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Northwest Africa 14754
Basic information Name: Northwest Africa 14754
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14754
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 699 g
Recommended:  L4-6    [explanation]

This is 1 of 48 approved meteorites (plus 1 unapproved name) classified as L4-6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 26 Mar 2022
Writeup from MB 111:

Northwest Africa 14754 (NWA 14754)


Purchased: 2010

Classification: Ordinary chondrite (L4-6)

History: Sample was purchased in 2010 from Adam Aaronson at the Tucson mineral show who acquired it from Morocco. Sample is catalogued at ROM as M60253.

Physical characteristics: A fist-sized blocky individual with 50% fusion crust and broken, somewhat pitted surfaces, all showing mature desert polish. Physical properties: Magnetic susceptibility measured for the 20.77 g type specimen is log χ (× 10-9 m3/kg) = 4.68.

Petrography: Cut face (7 cm2) shows chondrules, fragments and light colored clasts in a grey matrix which overall shows a weak foliation defined by oriented clastic content. Metal and sulfide grains are abundant. Clasts are subangular and chondritic, up to 8 mm size. Fe oxide weathering in the meteorite is limited to local staining of silicates around metal and sulfide grains. In polished thin section, discernable chondrules, chondrule fragments and individual grains occur in a fragmental groundmass. Chondrules are primarily of PO, POP, BO types. Isolatated chondrule mesostasis is dark and finely crystalline. Olivine and pyroxene grains show undulatory to mosaic extinction. Subangular clasts of up to 2 mm size are present in the section, exhibiting poor chondrule definition, matrix recrystallization, coarse metal grain size and embayment on silicates, indicating L5 and L6 chondrite. Olivine and pyroxene grains in the clasts have mosiac extinction and development of planar fractures.

Classification: Ordinary chondrite: L 4-6 (S3) W1. Bulk meteorite is L4, but a breccia bearing slightly more shocked L5, L6 clasts. Magnetic susceptibility is consistent with a weathered L chondrite.

Specimens: Type specimen location: ROM. Main mass: DGregory.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ, USA
Date:P 2010
Mass (g):699
Shock stage:S3
Weathering grade:W1
Magnetic suscept.:4.68
Classifier:P. McCausland, ROM, UWO
Type spec mass (g):20.77
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by V. Di Cecco, ROM
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater)

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