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Northwest Africa 12856 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12856 This is an OFFICIAL meteorite name. Abbreviation: NWA 12856 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: 468 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 21 Sep 2019 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12856 (NWA 12856) (Northwest Africa) Purchased: 2014 Classification: HED achondrite (Eucrite) History: Collected by nomads in Western Sahara and purchased by Parco Astronomico delle Madonie from Giorgio Tomelleri in 2018. Physical characteristics: A single piece weighing 468 g partialy covered with a black fusion crust. The cut surface displays scattered CAIs. Petrography: (V. Moggi Cecchi, G. Pratesi, UniFi); The thin section analyzed displays a basaltic texture. Orthopyroxene is the major phase, with crystals 100-160 μm in width; minor clinopyroxene and anorthitic plagioclase are visible. Exsolved low-Ca pyroxene crystals with fine (5-7 μm) pigeonite exsolution lamellae can be observed. Minor phases are ilmenite, troilite, chromite, and FeNi metal. Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, UniFi); Calcic plagioclase (An87.0±1.2Or0.4±0.2, n=4); low-Ca pyroxene (Fs58.0±1.3En34.3±0.3Wo7.7±0.1; n=6; Fe/Mn=49.9±0.5); diopside exsolution lamellae in orthopyroxene (Fs44.3±3.0En33.1±0.1Wo22.6±1.4; n=6; Fe/Mn = 39.1±0.5).; Classification: Eucrite with medium degree of shock and medium degree of weathering. Specimens: A total of 20.2 g specimen is on deposit at MSN-FI. Parco Astronomico delle Madonie holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB108 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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