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Northwest Africa 12866 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12866 This is an OFFICIAL meteorite name. Abbreviation: NWA 12866 Observed fall: No Year found: 2013 Country: Morocco Mass: 191 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 12866 (NWA 12866) Morocco Purchased: September 2013 Classification: HED achondrite (Eucrite) History: Sample number (LM58159) in the Royal Ontario Museum collection. Physical characteristics: A single angular stone partially covered with a black shiny fusion crust. The cut stone shows a fresh grey surface. Petrography: The thin section shows a complex polymict breccia, consisting of mineral clasts and large rock fragments of up to 2 cm long, embedded within a fine-grained clastic matrix. Rock fragments are composed of fine- and medium-grained pyroxene and plagioclase of granular and gabbroic texture. Both high-Ca exsolved augite and pigeonite is present; both show little to no mosaicism; augite lamellae are locally displaced by low shock. Plagioclase is relatively fresh and no maskelynite is present. Minor minerals are ilmenite, chromite, tridymite, quartz, apatite, merrillite, zircon and FeNi metal. Geochemistry: Mineral compositions and geochemistry: Ferrosilite (Wo1.2-4.5En32.1-42.7 Fs55.9-66.5; FeO/MnO=29.9-32.5) with Pigeonite lamellae (Wo5.2-18.2En32.3-41.5Fs48.3-61.3; FeO/MnO=30.9-32.2), pigeonite (Wo6.1-10En27.1-32.4Fs57.5-63.9; FeO/MnO=29.9-32.5) with augite lamellae (Wo22.4-32.6En27.8-37.3Fs31.5-49.6;FeO/MnO=29.4-32.2). Plagioclase ranges from An72-90 with an average of An81. 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) | ||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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