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Northwest Africa 7213
Basic information Name: Northwest Africa 7213
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7213
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 93.2 g
Meteoritical Bulletin:  MB 101  (2012)  LL3
Recommended:  LL3    [explanation]

This is 1 of 414 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 28 Aug 2012
Writeup from MB 101:

Northwest Africa 7213 (NWA 7213)

(Northwest Africa)

Purchased: 14 Aug 2011

Classification: Ordinary chondrite (LL3)

Petrography: The olivine range is Fa0.62-27.1; the low-Ca pyroxene range is Fs2.2-25.1. Chondrule types include C, BO, RP, PO, POP, and PP; chondrule diameters average ~600 μm. Low-Ca clinopyroxene with polysynthetic twins are present, but there is no clear chondrule glass. The heterogeneity of the olivine is appreciably greater than that of published values for H3.8 Dhajala, so the pet type is less than 3.8. However, most type 3.5 chondrites have a number of chondrules with clear glass; the lack of clear glass indicates that the rock is higher than 3.5. Because of the olivine and pyroxene heterogeneity, type 3.6 seems most appropriate. Also present in the thin section are two 800-1300 μm chondritic clasts containing chondrule fragments and recrystallized matrix, indicating that the rock is a breccia.

Data from:
  Table 0
  Line 0:
Place of purchase:ebay
Date:P 14 Aug 2011
Mass (g):93.2
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):11.9±8.5 (n=12)
Ferrosilite (mol%):11.2±7.2 (n=15)
Wollastonite (mol%):2.2±2.4
Classifier:Alan Rubin, UCLA
Type spec mass (g):22.02
Type spec location:UCLA
Main mass:Scott Feek
Comments:breccia; submitted by Alan Rubin
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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