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Northwest Africa 8228
Basic information Name: Northwest Africa 8228
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8228
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 45 g
Meteoritical Bulletin:  MB 104  (2015)  CM2
Recommended:  CM2    [explanation]

This is 1 of 639 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 31 Dec 2015
Writeup from MB 104:

Northwest Africa 8228 (NWA 8228)

(Northwest Africa)

Purchased: 2013 Dec

Classification: Carbonaceous chondrite (CM2)

History: Purchased by Adam Aaronson in Temara, Morocco in February 2014, and subsequently acquired by the Field Museum of Natural History.

Physical characteristics: Exceptionally fresh, very fine-grained black specimen (45 g) found as a group of five fragments.

Petrography: (M. Zolensky, JSC; A. Irving and S. Kuehner, UWS) Abundant matrix-supported chondrules (up to 1 mm across) and sparse angular olivine grains occur in an opaque matrix. The chondrules have thick fine-grained rims, and are very circular in thin section. Most chondrules have been partially to entirely pseudomorphed by serpentine, pyrrhotite, pentlandite, tochilinite, dolomite and Ca carbonate. Discrete olivine grains have thin serpentine rims. The matrix consists of serpentine with accessory pyrrhotite, pentlandite, dolomite and Ca carbonate.

Geochemistry: Olivine in chondrules (Fa1-2, CaO = 0.1-0.8 wt.%, N = 8), discrete olivine grains (Fa0.5-0.6, N = 3). Oxygen isotopes (K. Ziegler, UNM): analyses of five acid-washed subsamples by laser fluorination gave, respectively, δ17O -0.900, -1.715, -1.882, 3.087, 2.853; δ18O 4.730, 3.136, 4.246, 9.209, 9.117; Δ17O -3.397, -3.371, -4.124, -1.775, -1.961 per mil.

Classification: Carbonaceous chondrite (CM2)

Specimens: 9.1 g including one polished thin section at UWB; remainder at FMNH.

Data from:
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2013 Dec
Mass (g):45
Shock stage:S1
Weathering grade:low
Fayalite (mol%):0.5-2
Classifier:M. Zolensky, JSC; A. Irving and S. Kuehner, UWS
Type spec mass (g):9.1
Type spec location:UWB
Main mass:FMNH
Comments:M1648; submitted by A. Irving
Plots: O isotopes:  
   and collections
FMNH: NW Quadrant/Geology The Field Museum of Natural History 1400 South Lake Shore Drive Chicago, IL 60605-2496, USA, United States; Website (institutional address; updated 22 May 2024)
JSC: Mailcode XI, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 28 Jul 2022)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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