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Northwest Africa 12940 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12940 This is an OFFICIAL meteorite name. Abbreviation: NWA 12940 Observed fall: No Year found: 2012 Country: Morocco Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 2 May 2020 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 109:
Northwest Africa 12940 (NWA 12940) Morocco Purchased: 2012 Classification: HED achondrite (Eucrite) History: Purchased from A. Aaronson in 2012 at the Tucson Gem and Mineral Show, who provided origin of sample as being from Morocco. Catalogued in the Royal Ontario Museum as sample LM58201 Physical characteristics: The meteorite has a well-preserved, black fusion crust with little signs of weathering. Cracks in the fusion crust are not filled with caliche. Interior of the sample fresh light grey, intact, uniform with no obvious signs of shock or weathering. Petrography: Monomict breccia of basaltic clasts. Most pyroxene grains show mosaicism. Geochemistry: Mineral composition and geochemistry: Plagioclase An90.21±1.24 (n=23). Pyroxene composition: Fs40.68±13.81Wo1.35±0.42 and Mg#54.06 (n=29). Classification: (K. Tait, ROM). Texture and composition suggest the sample is a monomict breccia. | ||||||||||||||||||||||||||||
Data from: MB109 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) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:![]() |
Statistics: This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater) |