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| Northwest Africa 7213 | |||||||||||||||||||||||||||||||
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| 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:  93.2 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 365 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 |
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: MB101 Table 0 Line 0: |
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| Institutions 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) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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| Geography: |
Statistics: This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names) | ||||||||||||||||||||||||||||||