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Northwest Africa 7180 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7180 This is an OFFICIAL meteorite name. Abbreviation: NWA 7180 Observed fall: No Year found: 2011 Country: Algeria Mass: 241 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 43 approved meteorites classified as H3.6. [show all] Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||
Comments: | Approved 2 Mar 2012 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 100:
Northwest Africa 7180 (NWA 7180) Algeria Purchased: 11 July 2011 Classification: Ordinary chondrite (H3.6) Petrography: Chondrules average about 300 μm. The mean olivine Fa content is closest to the H-chondrite range. A few chondrules have isotropic glass. Polysynthetically twinned low-Ca pyroxene grains are common. The review paper by Sears and Hasan (1987) gives the ranges for standard deviations for different subtypes of type-3 OC. The standard deviation of olivine Fa divided by mean Fa in this rock is 37; this corresponds to type 3.6 in the Sears-Hasan table. | ||||||||||||||||||||||||||||||
Data from: MB100 Table 1 Line 1661: |
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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. 100, MAPS 49, E1-E101 (2014)
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Geography: |
Statistics: This is 1 of 1356 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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