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Northwest Africa 14605
Basic information Name: Northwest Africa 14605
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14605
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 91.9 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 15 Jan 2022
Writeup from MB 111:

Northwest Africa 14605 (NWA 14605)


Purchased: 2011

Classification: Ordinary chondrite (L4-6)

History: The meteorite was purchased in Tucson, Arizona in 2011 by D. Gregory from A. Aaronson. Specimen was investigated at UWO under the name DG-14-2011.

Physical characteristics: Rounded individual with 60% fusion crust and pitted broken surfaces, all with moderate desert varnish and pink soiling. There are some patches of FeO oxidation on the surface as well. Physical properties (P. Cassidy, UWO): Grain density measured by He-pycnometry on a 57.22 g piece is 3.472±0.005 g/cm3. Magnetic susceptibility on the same piece is log χ (× 10-9 m3/kg)=4.77.

Petrography: In cut surface, the meteorite is a grey breccia with subangular clasts up to 1.4 cm size of differing petrologic grade. Metal is apparent as mm grains, with minor local oxidation. In thin section, chondrules and chondrule fragments are well defined in a recrystallized matrix. Olivine grains show many planar fractures with weak mosaicism. A prominent 1.2 cm clast as well as smaller clasts in the thin section are all higher petrographic grade, containing chondrules that are barely discernable. In plane-polarized light, FeO staining can be seen throughout the sample, however, in reflected light, the Ni-Fe metal has not been significantly replaced by FeO.

Geochemistry: EPMA: olivine Fa24.12±0.99 (n=17); Ca-poor pyroxene Fs19.56±0.83Wo1.19±0.44 (n=10)

Classification: Ordinary chondrite: L4-6 breccia (S4) W1. Abundant fragmented chondrules and presence of clasts with higher petrographic grade indicate that this meteorite is a breccia.

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

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, Arizona
Date:P 2011
Mass (g):91.94
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):24.12±0.99 (n=17)
Ferrosilite (mol%):19.56±0.83 (n=10)
Wollastonite (mol%):1.19±0.44 (n=10)
Magnetic suscept.:4.77
Classifier:G. Osinski, A. Ozaruk, P. McCausland, UWO
Type spec mass (g):19.91
Type spec location:UWO
Main mass:Gregory
Comments:Submitted by P. McCausland
   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)
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     This is 1 of 1992 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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