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Northwest Africa 14492
Basic information Name: Northwest Africa 14492
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14492
Observed fall: No
Year found: 2021
Country: Morocco
Mass:help 5.26 kg
Classification
  history:
Recommended:  Pallasite, PMG    [explanation]

This is 1 of 50 approved meteorites (plus 1 unapproved name) classified as Pallasite, PMG.   [show all]
Search for other: Main group pallasites, Metal-rich meteorites, and Pallasites
Comments: Approved 11 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14492 (NWA 14492)

Morocco

Purchased: April 2021

Classification: Pallasite (Main group)

History: Robert Cucchiara and Ruben Garcia purchased several kilos of this material from Adam Aaronson at the April gem show in Tucson 2021.

Physical characteristics: The meteorite consists of nine pieces: 1710, 1313, 962, 411, 376, 180, 148, 99, and 60 g. The surface is irregular, with visible cm-scale olivine crystals. Terrestrial alteration is evident on the surface and along grain boundaries extending into the interior.

Petrography: (C. Herd and P. Hill, UAb) Optical examination of polished slices show angular to subrounded olivine grains ranging from sub-mm to cm in size irregularly distributed in a homogenous metal phase. Sulfide inclusions were noted but not analyzed. Standfieldite was identified by EDS during electron microprobe examination.

Geochemistry: (C. Herd and A. Locock, UAb) Data obtained by EMP examination of carbon-coated polished section: Olivine Fa10.8±0.1 (n=17). ICP-MS data obtained from metallic portion, using sample of North Chile (Filomena) as standard (C. Herd, P. Hill, and S. DuFrane UAb): Ni = 10.2, Co = 0.366 (both wt%); Ir = 0.04, Ga = 11.2, As = 10, Sb = 0.16, Ru = 0.6, Pt = 1.1, Cu = 117, Au = 0.37 (all μg/g). W concentration was below detection (<0.1 ppb). Au value is a minimum due to uncertainties associated with the solution ICP-MS method.

Classification: (C. Herd, UAb): Pallasite, PMG, based on Fa content of olivine and especially Ni, Ir, Ga, Pt, W, Cu, and Sb in metal, through comparison with Wasson and Choi (2003). Au in metal appears to have been underestimated (did not remain in solution).

Specimens: Type specimen consisting of 20.9 g in four representative specimens at UAb. Majority of specimens with Robert Cucchiara and Ruben Garcia; additional specimens with R. Ward and DPitt.

Bibliography:
  • Wasson J. T. and Choi B.-G. (2003) Main-group pallasites. Geochim. Cosmochim. Acta 67, 3079–3096. (link)
Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P April 2021
Mass (g):5259
Pieces:9
Class:Pallasite, PMG
Weathering grade:moderate
Fayalite (mol%):10.8±0.1 (n=17)
Classifier:C. Herd, UAb
Type spec mass (g):20.9
Type spec location:UAb
Main mass:Robert Cucchiara and Ruben Garcia
Comments:Submitted by C. Herd
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1871 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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