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Northwest Africa 13357
Basic information Name: Northwest Africa 13357
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13357
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 38.9 g
Recommended:  CK3-6    [explanation]

This is 1 of 3 approved meteorites classified as CK3-6.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 19 Jul 2020
Writeup from MB 109:

Northwest Africa 13357 (NWA 13357)


Purchased: 2020 Mar

Classification: Carbonaceous chondrite (CK3-6)

History: Purchased by John Higgins in March 2020 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh specimen composed of discrete unequilibrated, granular, magnetite-bearing chondrules (apparent diameter 1040±680 µm, N = 22) plus some equilibrated Type 6 clasts and set in a finer grained matrix containing calcic plagioclase and Cr-magnetite. Type 6 clasts consist of sparse remnant chondrules within a recrystallized magnetite-bearing matrix.

Geochemistry: Olivine in Type 6 clasts (Fa34.4±2.1, range Fa32.0-38.9, NiO = 0.5-0.7 wt.%, N = 7), low-Ca pyroxene (Fs27.3±0.1Wo0.9±0.0, range Fs27.2-27.3Wo0.9, N = 2), augite (Fs9.5Wo48.8), plagioclase (An82.1Or0.4; An54.7Or2.4; N = 2), magnetite (Cr2O3 = 5.8 wt.%), olivine in unequilibrated chondrule (Fa15.6±6.7, range Fa6.8-22.7, N = 5).

Classification: Carbonaceous chondrite (CK3-6 breccia).

Specimens: 8.3 g including one polished thin section at UWB; remainder with Mr. J. Higgins.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2020 Mar
Mass (g):38.92
Shock stage:S2
Weathering grade:low
Fayalite (mol%):34.4±2.1
Ferrosilite (mol%):27.3±0.1
Wollastonite (mol%):0.9±0.0
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):8.3
Type spec location:UWB
Main mass:J. Higgins
Comments:Work name JH20-2; submitted by A. Irving
   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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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