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Northwest Africa 14603
Basic information Name: Northwest Africa 14603
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14603
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 52.6 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  LL5
Recommended:  LL5    [explanation]

This is 1 of 3295 approved meteorites (plus 1 unapproved name) classified as LL5.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Jan 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14603 (NWA 14603)

Morocco

Purchased: 2011

Classification: Ordinary chondrite (LL5)

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-08-2011.

Physical characteristics: This specimen is light brownish-grey in color, with only a partial dark-brown fusion crust on one side making up ~20% of the meteorite’s surface. The remaining 80% of the surface shows pitted broken faces and is much lighter grey. Physical properties (P. Cassidy, UWO): Grain density measured by He-pycnometry on a 34.9 g piece is 3.337±0.021 g/cm3. Magnetic susceptibility on the same piece is log χ (× 10-9 m3/kg) = 4.27.

Petrography: The cut face shows a light-grey interior with abundant intact chondrules. Patchy, local FeO oxidation is present. In thin sections, large, intact chondrules of POP, PO, BO, RP types are visible, ranging up to 3 mm diameter. Several chondrules are armoured by troilite or in some cases Ni-Fe metal. Matrix is recrystallized, but chondrules can be readily defined, with most having dark fine grained rims. Olivine and pyroxene grains typically show sharp to undulatory extinction. Micro-XRD (R. Flemming, UWO) of the polished thin section shows significant diffraction streaks for olivine and pyroxene grains in 2D XRD, which indicates low to moderate shock. A small amount of Ni-Fe metal is visible, and has locally undergone some oxidation to goethite as identified by microXRD.

Geochemistry: EPMA: olivine Fa28.01±0.31; Ca-poor pyroxene Fs22.00±0.25Wo0.78±0.27.

Classification: Ordinary chondrite: LL5 (S2) W1

Specimens: Type specimen of 17.6 g along with two polished thin sections on deposit at UWO. Main mass: D. Gregory.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Tucson, Arizona
Date:P 2011
Mass (g):52.55
Pieces:1
Class:LL5
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):28.01±0.31 (n=18)
Ferrosilite (mol%):22.00±0.25 (n=8)
Wollastonite (mol%):0.78±0.27 (n=8)
Magnetic suscept.:4.27
Classifier:G. Osinski, A. Ozaruk, P. McCausland, UWO
Type spec mass (g):17.6
Type spec location:UWO
Main mass:Gregory
Comments:Submitted by P. McCausland
Institutions
   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)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 2068 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)
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Revision
  history:
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