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Northwest Africa 12899 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12899 This is an OFFICIAL meteorite name. Abbreviation: NWA 12899 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: 79 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 3 Jul 2020 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 12899 (NWA 12899) Northwest Africa Purchased: 2017 Classification: HED achondrite (Eucrite) History: A single stone weighing 77 g was found by an anonymous finder in Western Sahara and purchased in October 2017 at the Munich Fair for the collections of the Museo di Storia Naturale - SMA, University of Florence, Italy. Physical characteristics: The main mass is partially covered by a black, shiny fusion crust with several cracks. Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi): The thin section analyzed displays a basaltic texture. Orthopyroxene crystals, ranging in width from 80 to 160 μm are common, with minor clinopyroxene and anorthitic plagioclase. Low-Ca pyroxene crystals with fine (2-5 μm) pigeonite exsolution lamellae are diffuse. Minor phases are FeNi metal and troilite, with rare ilmenite and chromite grains. Geochemistry: EMP (V.Moggi Cecchi, G.Pratesi, S.Caporali UniFi); Host: low-Ca pyroxene (Fs62.1±0.3En35.1±0.7Wo2.8±0.3; n=7; Fe/Mn = 34.0±0.2); Diopside exsolution lamellae in orthopyroxene (Fs27.5±0.2En28.7±0.3Wo44.0±0.2; n=8; Fe/Mn = 30.0±0.3); Calcic plagioclase An86.8±0.5Or0.6±0.5, n=9; Classification: Eucrite with medium degree of shock and medium degree of weathering. Specimens: The main mass, weighing 55 g, the type specimen, weighing 24 g, and one thin section are on deposit at MSN-FI (Inventory N G-75062). | ||||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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Institutions and collections |
MSN-FI: Museo di Storia Naturale “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze
Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022) UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013) |
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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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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