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Northwest Africa 14495
Basic information Name: Northwest Africa 14495
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14495
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 289 g
Classification
  history:
Recommended:  Iron, IVA    [explanation]

This is 1 of 81 approved meteorites (plus 1 unapproved name) classified as Iron, IVA.   [show all]
Search for other: Iron meteorites, IVA irons, and Metal-rich meteorites
Comments: Approved 15 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14495 (NWA 14495)

(Northwest Africa)

Purchased: Feb 2020

Classification: Iron meteorite (IVA)

History: Purchased from Matthew Stream in February 2020, who purchased it from a Moroccan dealer.

Physical characteristics: The single, irregular mass has a mottled dark brown to black, pitted surface.

Petrography: (C. Herd and P. Hill, UAb) Petrographic investigation of a 2 cm × 4.5 cm polished and etched slice shows a well-developed Widmanstaetten pattern consistent with finest octahedrite structural classification (estimated based on photos provided by the owner). No inclusions were observed. No terrestrial alteration is present.

Geochemistry: ICP-MS data, using sample of North Chile (Filomena) as standard (C. Herd, P. Hill, and S. DuFrane UAb): Ni = 8.0, Co = 0.372 (both wt%); Ir = 1.9, Ga = 2.0, Ge = 1.3, As = 5.3, Ru = 4.0, Re = 0.2, Os = 1.5, W = 0.44, Pt = 5.8, Cu = 150, Au = 0.07 (all μg/g). Au value is a minimum due to uncertainties associated with the solution ICP-MS method.

Classification: (C. Herd and P. Hill, UAb): IVA iron, finest octahedrite (estimated). Classification is based on Ni, Co, Ir, Ga, As, W, Pt and Cu, by comparison with Wasson and Richardson (2001). Ge appears to be overestimated, and Au appears to have been underestimated (did not remain in solution).

Specimens: Type specimen consisting of a 23.4 g slice at UAb. Main mass with Shun-Chung Yang.

Bibliography:
  • Wasson J.T. and Richardson J.W. (2001) Fractionation trends among IVA iron meteorites: contrasts with IIIAB trends. Geochem. Cosmochim. Acta 65, 951-970. (link)
Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Internet
Date:P Feb 2020
Mass (g):289
Pieces:1
Class:Iron, IVA
Shock stage:low
Weathering grade:low
Classifier:C. Herd, UAb
Type spec mass (g):23.4
Type spec location:UAb
Main mass:Shun-Chung Yang
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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