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Northwest Africa 12867 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12867 This is an OFFICIAL meteorite name. Abbreviation: NWA 12867 Observed fall: No Year found: 2011 Country: Morocco Mass: 19.3 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 603 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 11 Oct 2019 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12867 (NWA 12867) Morocco Purchased: Febuary 2011 Classification: HED achondrite (Eucrite) History: Sample number (LM57450) in the ROM collection. Physical characteristics: A single small and rounded stone covered with a black shiny fusion crust. The cut stone shows a fresh grey surface. Petrography: The thin section shows one distinct lithological clast (60 mm in diameter) and a mixture of mineral and basaltic clasts embedded within a fine-grained clastic matrix. The lithological clast is a medium-grained enstatite-plagioclase rock of granular texture with a large chromite situated within. Both high-Ca exsolved augite and pigeonite is present as mineral clasts; both show little to no mosaicism. Plagioclase is relatively fresh both within the lithological clast and as mineral clasts with no maskelynite present. Minor minerals are olivine, ilmenite, chromite, tridymite, quartz, apatite, merrillite, zircon and FeNi metal. Geochemistry: Mineral compositions and geochemistry: Enstatite (Wo1.7-4.9En50.9-57.5Fs40.7-46.6;FeO/MnO=29-35.4), pigeonite (Wo5.1-17.1En32.2-37.8Fs45-59.4; FeO/MnO=27.5-32) with augite lamellae (Wo36.2-37.7 En26.9-34.5Fs29.1-44.9; FeO/MnO=27.8-32.6), Ferrosilite (Wo2.4-3.6En40.2-43.7Fs52.6-57.1; FeO/MnO=29.7-31.7) with high-Ca pyroxene (Wo19-20En35.9-39.5Fs40.4-44.9; FeO/MnO=28.1-29.2). Plagioclase ranges from An59-97 with an average of An87. Olivine ranges from Fo40.2-71.9 with an average of Fo64.4. Classification: Eucrite (polymict breccia) | ||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Institutions and collections |
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011) UPort: University of Portsmouth Winston Churchill Avenue Portsmouth, Hampshire PO1 2UP, United Kingdom (institutional address; updated 11 Oct 2019) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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