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Northwest Africa 5519
Basic information Name: Northwest Africa 5519
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5519
Observed fall: No
Year found: 2001
Country: Morocco
Mass:help 3.86 kg
Recommended:  LL3    [explanation]

This is 1 of 469 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 1 Oct 2022
Writeup from MB 111:

Northwest Africa 5519 (NWA 5519)


Purchased: 2001

Classification: Ordinary chondrite (LL3)

History: The meteorite was purchased in Tucson, Arizona, in 2001 by D. Gregory from A. Aaronson. Origin is Erfoud, Morocco.

Physical characteristics: Rounded, fusion crust-covered individual with moderate desert polish.

Petrography: Cut faces reveal variously coloured chondrules set in a dark brown matrix, with sparse metal. Most larger chondrules show flattening of up to 1.3:1 aspect ratio, defining a foliation fabric in the bulk rock. In polished thin section, chondrules are well defined with sulphide-rich dark rims in a dark matrix. Chondrules have average diameters of 634±238 μm (n=23) and are dominantly of types PO, BO, POP. Olivine and pyroxene grains show mosaic extinction and extensive development of planar fracturing. In BSE images and EDS elemental maps, olivine and pyroxene grains show significant normal zoing to Fe rich rims, and chondrule mesostasis is typically feldspathic glass. Metal occurs as isolated subhedral grains. Sulfides are typically fine grained and are a major component of chondrule rims. Minor Fe oxides locally fill cracks.

Geochemistry: EPMA: olivine Fa16.5 (range Fa0.7-28.4, N=63); Ca-poor pyroxene Fs17.0Wo2.6 (range Fs1.1-35.2Wo0.1-14.9, N=34). An 18.26 g sample gives a magnetic susceptibility of log χ (× 10-9 m3/kg) = 4.47.

Classification: Ordinary chondrite: LL3 (S4) W1. Estimated subtype 3.2. Large chondrule size, low metal content and low magnetic susceptibility are consistent with a relatively fresh LL chondrite. Strongly zoned olivine and pyroxene grains with large EPMA compositional variation indicate that the meteorite is unequilibrated. Pervasive chondrule glassy mesostasis and fine sulfide rims on chondrules suggest type 3.2. Mineral deformation and chondrule flattening is consistent with shock S4.

Specimens: Type specimen with polished thin section at UWO. Main mass Gregory.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, Arizona
Date:P 2001
Mass (g):3860
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):16.5 (0.7-28.4, N=63)
Ferrosilite (mol%):17.0 (1.1-35.2, N=34)
Wollastonite (mol%):2.6 (0.1-14.9, N=34)
Magnetic suscept.:4.47
Classifier:P. McCausland (UWO)
Type spec mass (g):21.8
Type spec location:UWO
Main mass:David Gregory
Comments:LL3.2 chondrite with a foliation fabric defined by flattened chondrules.; submitted by P. McCausland (UWO)
   and collections
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)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
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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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