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Northwest Africa 7055
Basic information Name: Northwest Africa 7055
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7055
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 26.9 g
Meteoritical Bulletin:  MB 107  (2018)  CK4/5
Recommended:  CK4/5    [explanation]

This is 1 of 15 approved meteorites classified as CK4/5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 27 Mar 2018
Writeup from MB 107:

Northwest Africa 7055 (NWA 7055)

(Northwest Africa)

Purchased: 2007 Jan

Classification: Carbonaceous chondrite (CK4/5)

History: Purchased by Dr. David DGregory in January 2007 from a dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh specimen consisting of separated chondrules (apparent diameter 0.2-2.0 mm) containing Cr-magnetite set within a relatively coarse grained matrix. The texture is transitional between type 4 and type 5.

Geochemistry: Olivine (Fa30.9-31.1, N = 2), orthopyroxene (Fs25.4-26.3Wo0.5-0.9, N = 3), clinopyroxene (Fs9.4-11.2Wo46.5-42.6, N = 2), one exotic ferroan olivine grain (Fa62.7).

Classification: Carbonaceous chondrite (CK4/5).

Specimens: The entire specimen plus a polished thin section and polished thick section at ROM.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2007 Jan
Mass (g):26.93
Shock stage:S2
Weathering grade:low
Fayalite (mol%):30.9-31.1
Ferrosilite (mol%):25.4-26.3
Wollastonite (mol%):0.5-0.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):26
Type spec location:ROM
Main mass:DGregory
Comments:LM52939; submitted by A. Irving
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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