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Northwest Africa 15504
Basic information Name: Northwest Africa 15504
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15504
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 47.5 g
Classification
  history:
Recommended:  EL-melt rock    [explanation]

This is 1 of 24 approved meteorites classified as EL-melt rock.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), Enstatite-rich meteorites, and Melted chondrites
Comments: Approved 23 Feb 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15504 (NWA 15504)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Enstatite chondrite (EL melt rock)

History: Purchased by Nicholas Gessler in February 2013 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) The specimen is overall a fine grained polycrystalline aggregate, but rare well-delineated, glass-bearing RP chondrules are present. Composed predominantly of enstatite together with accessory sodic plagioclase, silica polymorph, highly altered Si-bearing kamacite, Ti-bearing troilite, daubreelite, schreibersite, plus abundant secondary Fe hydroxides (as prevasive subparallel veinlets) and some secondary calcite.

Geochemistry: Enstatite (Fs0.5±0.2Wo1.4±0.0, range Fs0.2-0.9Wo1.4-1.5, N = 8), plagioclase (Ab80.5±0.7Or4.2±0.4, range Ab79.4-81.5Or3.5-4.6, N = 7), kamacite (Ni 6.0-6.3 wt.%, Si 1.1 wt.%, N = 5).

Classification: EL-melt rock. Likely paired with Al Haggounia 001 and related material, as described by Rubin (2016).

Specimens: 14.5 g plus one polished thin section at UWB; remainder with Mr. N. Gessler.

Bibliography:
  • Rubin A.E. (2016) Impact melting of the largest known enstatite meteorite: Al Haggounia 001, a fossil EL chondrite. Meteorit. Planet. Sci. 51 1576-1587. (link)
Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2013 Feb
Mass (g):47.5
Pieces:1
Class:EL-melt rock
Shock stage:S6
Weathering grade:W3/4
Ferrosilite (mol%):0.5±0.2
Wollastonite (mol%):1.4±0.0
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):14.5
Type spec location:UWB
Main mass:N. Gessler
Comments:Work name NG-GE; submitted by A. Irving
Institutions
   and collections		 UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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