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Northwest Africa 14602
Basic information Name: Northwest Africa 14602
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14602
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 115.5 g
Recommended:  L3    [explanation]

This is 1 of 793 approved meteorites (plus 1 unapproved name) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 15 Jan 2022
Writeup from MB 111:

Northwest Africa 14602 (NWA 14602)


Purchased: 2011

Classification: Ordinary chondrite (L3)

History: The meteorite was purchased in Tucson, Arizona in 2011 by D. Gregory from A. Aaronson as a single fusion crusted 115.45 g individual. Specimen was investigated at UWO under the name DG-07-2011.

Physical characteristics: The meteorite surface is approximately 40% covered by fusion crust, showing moderately developed desert varnish. Many well-defined chondrules can be seen through fusion crust. Broken faces show chondrules approximately 2 mm or smaller in diameter. About 40% of the surface shows visible weathering associated with its burial in the desert. Physical properties: Grain density measured via He pycnometry for the 93.50 g main mass is 3.477 ± 0.002 g/cm3. Magnetic susceptibility for a 10.56 g piece is log χ (× 10-9 m3/kg) = 4.76.

Petrography: Transmitted light microscopy shows a fine-grained matrix with minor red staining from weathering. The mean diameter of the chondrules is 0.6 mm. Chondrules are sharply defined, with olivine in some chondrule grains exhibiting mosaic extinction. Using reflected light microscopy, the average metal content is estimated to be ?5 vol%. Most of the metal grains are small and disseminated in matrix, with a few larger grains, and minor metal rimming some chondrules. Olivines are zoned in BSE images. Micro-XRD (R. Flemming, UWO) of the polished thin section shows significant diffraction streaks for olivine and pyroxene grains in 2D XRD, which indicates moderate shock.

Geochemistry: EPMA: olivine Fa21.5±7.5 (n=25); Ca-poor pyroxene Fs12.3±8.1Wo0.63±0.60 (n=14).

Classification: Ordinary chondrite L3 (S4) W1. Variability of olivine and pyroxene compositions and petrography suggest a petrographic subtype 3.6. Petrographic and Micro-XRD observations of olivine and pyroxene grains are consistent with shock level S4. Reflected light micrograph images show a small amount of rust forming around metal grains. Weathering is therefore W1.

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):115.45
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):21.5±7.5 (n=25)
Ferrosilite (mol%):12.3±8.1 (n=14)
Wollastonite (mol%):0.63±0.6 (n=14)
Magnetic suscept.:4.76
Classifier:P. McCausland, P. Cassidy, UWO
Type spec mass (g):20.73
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 1902 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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