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Northwest Africa 14937
Basic information Name: Northwest Africa 14937
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14937
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 137.8 g
Recommended:  LL5-6    [explanation]

This is 1 of 63 approved meteorites classified as LL5-6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 13 May 2022
Writeup from MB 111:

Northwest Africa 14937 (NWA 14937)


Purchased: 2012

Classification: Ordinary chondrite (LL5-6)

History: Sample was purchased in 2012 from Adam Aaronson at the Tucson mineral show who acquired it from Morocco. Sample is catalogued at ROM as M58920.

Physical characteristics: A disk-shaped orineted individual with nearly complete dark fusion crust, modified by slight desert polish and dun-brown fractures and weathering of minor broken surfaces. Individual has a small associated piece broken from rim. Orientation features are flow lines leading from broad domed surface to rims. Reverse smaller side is concave with thin rough fusion crust over visible chondrules in face. Physical properties: Magnetic susceptibility measured for a 11.41 g endpiece is log χ (× 10-9 m3/kg) = 4.15.

Petrography: Cut faces (9 cm2) reveal a brecciated grey interior, with abundant light colored subangular chondritic clasts up to cm size set in a darker groundmass, bearing fine, distributed metal grains. In polished thin section, the stone is a fragmental breccia, consisting of chondrule fragments, some chondrules and abundant chondritic clasts of petrologic grade 5 or 6. Olivine throughout stone shows well developed planar fractures and undulatory to mosaic extinction. Groundmass is dark and clastic, with clastic objects showing 20 µm fine grained rims. In reflected light and BSE images, sparse metal grains typically have simplified or embayed grain boundaries with silicates, and locally have associated Fe oxides. Troilite occurs in clasts and is widespread in groundmass with grains up to 400 µm size. Accessory phases are chromite and apatite.

Geochemistry: EPMA: Olivine Fa30.60±1.13 (n=30); Ca-poor pyroxene Fs24.57±1.17, Wo1.80±0.55 (n=23); Ca-rich pyroxene Wo43.17±1.81 and Fs10.58±1.18 (n=7).

Classification: Ordinary chondrite: LL 5-6 (S4) W1. EPMA compositions for olivine and pyroxene grains and their observed variation are consistent with LL 5-6 classification. Magnetic susceptibility is consistent with a lightly 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 2012
Mass (g):137.83
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):30.60±1.13
Ferrosilite (mol%):24.57±1.17, 10.58±1.18
Wollastonite (mol%):1.80±0.55, 43.17±1.81
Magnetic suscept.:4.15
Classifier:P. McCausland, ROM, UWO
Type spec mass (g):21.74
Type spec location:ROM
Main mass:DGregory
Comments:Oriented nearly complete stone. Shocked LL 5-6 breccia; 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 1886 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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