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Northwest Africa 12240 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12240 This is an OFFICIAL meteorite name. Abbreviation: NWA 12240 Observed fall: No Year found: 2017 Country: Mauritania Mass: 1808 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 6484 approved meteorites (plus 2 unapproved names) classified as H4. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||
Comments: |
Approved 20 Oct 2018 Revised 6 Nov 2018: Corrections to mass | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 12240 (NWA 12240) Mauritania Find: 2017 Classification: Ordinary chondrite (H4) Petrography: The rock contains well-defined RP, PP, PO, and BO chondrules ranging from 80 to 1100 µm in diameter and averaging ~400 µm. Opaques include metallic Fe-Ni, troilite and chromite. There are many shock features: (1) Most troilite grains are polycrystalline. (2) Some kamacite grains contain small irregular grains of troilite, some also containing metallic Cu (up to 8x30 µm in size) adjacent to the trolite. (3) Also present are chromite-plagioclase assemblages and chromite veinlets inside olivine grains. The typical plagioclase grain is 5-10 µm in size. All of the low-Ca pyroxene grains are orthorhombic. | ||||||||||||||||||||||||||||||
Data from: MB107 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. 107, MAPS 55, 460-462
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Geography: |
Statistics: This is 1 of 220 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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