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Northwest Africa 11855
Basic information Name: Northwest Africa 11855
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11855
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 980 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  H6
Recommended:  H6    [explanation]

This is 1 of 6210 approved meteorites (plus 9 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Jun 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11855 (NWA 11855)

(Northwest Africa)

Purchased: 2017 Oct

Classification: Ordinary chondrite (H6)

History: Purchased by Stefan Ralew in October 2017 from a Moroccan dealer at the Munich Show.

Petrography: (A. Irving and S. Kuehner, UWS) Shock-darkened breccia. Very sparse remnant chondrules occur in a recrystallized matrix containing merrillite, altered kamacite and taenite. Some secondary goethite veinlets are present.

Geochemistry: Olivine (Fa19.9-20.0, N = 3), orthopyroxene (Fs16.9-17.6Wo1.2-1.1, N = 3), clinopyroxene (Fs6.4-9.3Wo45.9-44.7, N = 2).

Classification: Ordinary chondrite (H6 breccia, shock-darkened).

Specimens: 20.8 g including one polished slice and one polished thin section at UWB; remainder with Mr. S. Ralew.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2017 Oct
Mass (g):980
Pieces:1
Class:H6
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):19.9-20.0
Ferrosilite (mol%):16.9-17.6
Wollastonite (mol%):1.2-1.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.8
Type spec location:UWB
Main mass:S. Ralew
Comments: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)
Ralew: Stefan Ralew, Kunibertstra├če 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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