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Northwest Africa 11557
Basic information Name: Northwest Africa 11557
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11557
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 393 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  H5
Recommended:  H5    [explanation]

This is 1 of 10297 approved meteorites (plus 45 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Dec 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11557 (NWA 11557)

(Northwest Africa)

Purchased: 2016

Classification: Ordinary chondrite (H5)

History: Purchased by Ben Hoefnagels in 2017 from a dealer in Guelmim, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Sparse chondrules (some well-formed) occur in a recrystallized matrix containing relatively abundant altered metal.

Geochemistry: Olivine (Fa18.9-19.3, N = 2), orthopyroxene (Fs16.4-16.6Wo1.9-1.2, N = 2), subcalcic augite (Fs26.9Wo32.9), augite (Fs5.6-6.6Wo44.0-44.7, N = 2).

Classification: Ordinary chondrite (H5).

Specimens: 20.27 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016
Mass (g):393
Pieces:1
Class:H5
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):18.9-19.3
Ferrosilite (mol%):16.4-16.6
Wollastonite (mol%):1.9-1.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.27
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH118; 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)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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