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Northwest Africa 12863 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12863 This is an OFFICIAL meteorite name. Abbreviation: NWA 12863 Observed fall: No Year found: 2016 Country: (Northwest Africa) Mass: 410 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 595 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 12863 (NWA 12863) (Northwest Africa) Purchased: 2016 Classification: HED achondrite (Eucrite) History: Catalogued in the ROM collection as LM58157 Physical characteristics: Heavily weathered fusion crust present, beige to brown in color. Cracks in the fusion crust filled in with caliche or oxides. Interior of sample is intact, but weathered as well, with caliche covering 50% of the surface. Where visible the interior of the meteorite is light grey, with some larger grey to black clasts visible. Petrography: (K.Tait, I. Nicklin, ROM) Breccia composed of basaltic to gabbroic clasts with mineral fragments and shards of dark melt-glass set in a very finely grained comminuted matrix. The largest clast is 4 × 3 mm. Mineral fragments show variable shock stages ranging from undulous extinction to mild mosaicism. Geochemistry: Mineral composition and geochemistry: Plagioclase An87.8±3.4 (n = 30). Low-Ca pyroxene composition: Fs39.5±3.4Wo9.5±4.7 (n=27). Mg#33.4-49.6 (n=27). | ||||||||||||||||||||||||||||
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) DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address) |
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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 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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