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Northwest Africa 6718
Basic information Name: Northwest Africa 6718
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6718
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 1864 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  R4
Recommended:  R4    [explanation]

This is 1 of 58 approved meteorites classified as R4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 1 Dec 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 6718 (NWA 6718)

(Northwest Africa)

Purchased: 2011 Feb

Classification: Rumuruti chondrite (R4)

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of chondrite clasts and chondrules in a finer grained matrix. Portions of the specimen are unaltered, but other regions contain orange hydroxides after primary metal grains. Olivine, orthopyroxene, clinopyroxene, sodic plagioclase, Ti-chromite and altered kamacite.

Geochemistry: Olivine Fa38.5-38.6; a few relict magnesian olivine cores (Fa6.5, Fa13.5); orthopyroxene Fs4.9Wo0.5, Fs18.9Wo1.3; clinopyroxene Fs10.0-11.2Wo45.9-45.6 (Cr2O3 = 0.7-1.1 wt.%). The orthopyroxenes analyzed include both relict magnesian cores and more ferroan rims.

Classification: R chondrite breccia, R4.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2011 Feb
Mass (g):1864
Pieces:1
Class:R4
Shock stage:S2
Weathering grade:low
Fayalite (mol%):38.5-38.6
Ferrosilite (mol%):4.90, 18.9
Wollastonite (mol%):0.5, 1.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:P. Mani
Comments:PCM11-1; 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 Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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