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Northwest Africa 14841
Basic information Name: Northwest Africa 14841
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14841
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 727 g
Recommended:  LL4-6    [explanation]

This is 1 of 78 approved meteorites classified as LL4-6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 8 May 2022
Writeup from MB 111:

Northwest Africa 14841 (NWA 14841)


Purchased: 2010

Classification: Ordinary chondrite (LL4-6)

History: Sample was purchased in 2010 from Adam Aaronson at the Tucson mineral show who acquired it from Morocco. Sample is catalogued at the ROM as M60252.

Physical characteristics: Fist-sized, weathered individual with remnants of fusion crust under a mature desert polish surface. Broken surfaces are knobby, with dun brown weathering and throughgoing cracks. Physical properties: Magnetic susceptibility measured for the 26.72 g type specimen endpiece is log χ (× 10-9 m3/kg) = 3.40.

Petrography: Cut faces (27 cm2) reveals a pervasively dun brown weathered breccia, bearing isolated chondrules and dark subangular clasts up to cm size. Metal grains are sparse. In polished thin sections, large chondrules and chondrule fragments of POP, RP, GO and BO types are well defined in a finely recrystallized, porous matrix, which also contains individual grains up to 400 µm size. Olivine and pyroxene in chondrules and as individual grains exhibit sharp to undulatory extinction. Subangular clasts occupy 25 vol% of the stone, and in thin section appear as moderately to highly recrystallized chondrites, with low porosity and displaying evidence for shock including pervasive planar fracturing and mosaicism of olivine and pyroxene. In reflected light, sulphides are abundant in matrix and as rounded blebs in in some chondrules, and more rarely occur with metal in aggregates up to 600 µm size. Metal and sulfide have associated Fe oxide alteration haloes and Fe oxides locally fill void space and cracks.

Classification: Ordinary chondrite: LL 4-6 (S2) W2. Meteorite is a moderately weathered breccia consisting of an LL4 (S2) host lithology containing LL5 and LL6 moderately shocked (S4) clasts. Magnetic susceptibility is consistent with a weathered LL chondrite.

Specimens: Type specimen location: ROM. Main mass: D. Gregory.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ, USA
Date:P 2010
Mass (g):727
Shock stage:S2
Weathering grade:W2
Magnetic suscept.:3.40
Classifier:P. McCausland, ROM, UWO
Type spec mass (g):26.72
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 1894 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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