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Northwest Africa 14609
Basic information Name: Northwest Africa 14609
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14609
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 143.4 g
Recommended:  L5    [explanation]

This is 1 of 8487 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Jan 2022
Writeup from MB 111:

Northwest Africa 14609 (NWA 14609)


Purchased: 2017

Classification: Ordinary chondrite (L5)

History: Sample was purchased from Said Haddany at the Tucson mineral show who acquired it from Morocco. Sample is catalogued at the Royal Ontario Museum as M58502.

Physical characteristics: Flat, round disklike individual with chocolate brown fusion crust and minor weathered, broken surfaces. Fusion crust has flow lines and moderate desert polish. Physical properties: Magnetic susceptibilty of the 23.02 g type specimen is log χ (× 10-9 m3/kg) = 4.56

Petrography: In cut surfaces totalling 12 cm2, the interior of the stone is an orange-weathered chondrite with disseminated metal grains showing localized Fe-oxide weathering. Fine shock veins are evident in the cut surfaces. In polished thin section, chondrules are not well defined, and are set within a recrystallized matrix. Olivine shows undulatory to mosaic extinction and planar fractures are common. The thin section confirms the presence of thin dark shock veins and local pockets that crosscut matrix and chondrules, filled with a dark, fine-grained silicate material. In reflected light, troilite is more abundant than metal, with both phases commonly surrounded by Fe-oxide alteration, which also lines vugs and local cracks.

Classification: Ordinary chondrite L5 (S4) W2. Degree of matrix recrystallization suggests type 5. Low metal content and prevalence of sulfides suggests L classification. Moderate to high shock S4 is indicated by the presence of shock veins and olivine shock damage. Pervasive Fe-oxide staining of silicates and minor breakdown of metal and sulfides suggests weathering W2. Magnetic susceptibility is consistent with L chondrite.

Specimens: Type specimen ROM; main mass Gregory

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2017
Mass (g):143.42
Shock stage:S4
Weathering grade:W2
Magnetic suscept.:4.56
Classifier:P. McCausland (ROM, UWO), V Di Cecco (ROM)
Type spec mass (g):23.02
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)
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 1903 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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