header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 27 Nov 2022
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 14242
Basic information Name: Northwest Africa 14242
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14242
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 21 g
Classification
  history:
Recommended:  Iron, IAB-ung    [explanation]

This is 1 of 68 approved meteorites classified as Iron, IAB-ung.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 13 Nov 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14242 (NWA 14242)

(Northwest Africa)

Purchased: 2020 Sept

Classification: Iron meteorite (IAB, ungrouped)

History: The single, 21 g stone was reportedly found in Algeria in August 2020. Purchased by Juan Chen and Shun-Chung- Yang from a dealer residing in Tindouf in September 2020. Dr. Celestian, NMHLA made the primary assessment by XRF analysis indicating it an iron meteorite.

Physical characteristics: The roughly ellipsoid meteorite is approximately 2.5 × 1.5 × 1.5 cm and has a reddish-brown exterior. Cut surfaces reveal several inclusions that are square in cross-section, and between 5 and 8 mm across. The inclusions are mostly clustered to one side of the interior with some corners are in contact with one another.

Petrography: (C. Herd and P. Hill, UAb; E. Walton, MacEwan U) Petrographic investigation by scanning electron microscopy at UAb and Raman spectroscopy at MacEwan U show that the main metallic portion is composed of lozenge-shaped kamacite and ~20 μm sized schreibersite swathed in kamacite, set in a matrix of taenite. The inclusions have an hourglass-shaped center area composed of a fine-grained (<15 μm) intergrowth of equant silica and interstitial graphite. Marginal to the silica-rich center areas, the inclusions are composed of irregular, 50-100 μm taenite and schreibersite grains intergrown with kamacite. This kamacite hosts laths of graphite that are up to 5 μm across and 15 μm long. Raman confirmed the presence of graphite but was not able to identify the silica phase. No terrestrial alteration was observed.

Geochemistry: ICP-MS data, using sample of North Chile (Filomena) as standard (C. Herd, P. Hill, and S. DuFrane UAb): Ni = 11.0, Co = 0.49 (both wt%); Ir = 1.1, Ga = 61, Ge = 220, As = 16, Sb = 1.3, Ru = 4.6, Re = 0.09, Os = 1.0, Pt = 4.5, Cu = 426, Au = 1.5 (all μg/g). Au value is a minimum due to uncertainties associated with the solution ICP-MS method.

Classification: (C. Herd, UAb): IAB iron, ungrouped. Element concentrations fall between the MG and sLM subgroups of Wasson and Kallemeyn (2002). Ungrouped based on texture and mineralogy.

Specimens: Type specimen consisting of a 5.3 g representative piece at NHMLA. Additional 1.65 g slice, from which trace elements were obtained, at UAb. Main mass with Shun-Chung Yang.

Bibliography:
  • Wasson J.T. and Kallemeyn, G.W. (2002) The IAB iron-meteorite complex: A group, five subgroups, numerous grouplets, closely related, mainly formed by crystal segregation in rapidly cooling melts. Geochim. Cosmochim. Acta 66 2445-2473 (link)
Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2020 Sept
Mass (g):21
Pieces:1
Class:Iron, IAB-ung
Weathering grade:low
Classifier:C. Herd, UAb
Type spec mass (g):7.95
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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

Direct link to this page