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Northwest Africa 10691
Basic information Name: Northwest Africa 10691
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10691
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 97.9 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  CK4
Recommended:  CK4    [explanation]

This is 1 of 121 approved meteorites classified as CK4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 2 Jul 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10691 (NWA 10691)

(Northwest Africa)

Purchased: 2016 Mar

Classification: Carbonaceous chondrite (CK4)

History: Purchased by Aras Jonikas in March 2016 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed, separated chondrules containing Cr-magnetite occur in a matrix with stained Cr-magnetite in addition to olivine, orthopyroxene, clinopyroxene and intermediate plagioclase.

Geochemistry: Olivine (Fa29.3-29.5, N = 3), orthopyroxene (Fs19.9-21.9Wo0.8-0.5, N = 3), clinopyroxene (Fs9.1-9.8Wo47.3-46.0, N = 2).

Classification: Carbonaceous chondrite (CK4).

Specimens: 20.01 g including one polished thin section at PSF; remainder with Mr. A. Jonikas.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016 Mar
Mass (g):97.88
Pieces:1
Class:CK4
Shock stage:S2
Weathering grade:low
Fayalite (mol%):29.3-29.5
Ferrosilite (mol%):19.9-21.9; 9.1-9.8
Wollastonite (mol%):0.8-0.5; 47.3-46.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.01
Type spec location:PSF
Main mass:A. Jonikas
Comments:AJ16-10; submitted by A. Irving
Institutions
   and collections		 PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ziyao Wang   
Geography: 
Coordinates:Unknown.

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

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