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Northwest Africa 12748 | |||||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12748 This is an OFFICIAL meteorite name. Abbreviation: NWA 12748 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: 36 g | ||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 633 approved meteorites classified as CM2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites | ||||||||||||||||||||||||||||||||||
Comments: | Approved 3 Aug 2019 | ||||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12748 (NWA 12748) (Northwest Africa) Purchased: 2019 Classification: Carbonaceous chondrite (CM2) History: Two stones weighing 36 g were found in Morocco prior to 2019 and were purchased by John Sinclair and J. Donald Cline at the 2019 Tucson Gem and Mineral Show. Physical characteristics: Sample is dark black in color, irregularly shaped, and has ~25% crust coating one side. Cut face of the sample shows small chondrules and CAIs set within a dark-colored matrix. Petrography: Description and classification (A. Love, App): Sample is shows chondritic texture composed of chondrules, fragments, and CAIs (~42 vol %) distributed throughout a black fine-grained matrix (~58 vol%). Porphyritic chondrules have an average diameter of 330 µm with chemical zonation. Additional minerals are: pentlandite, calcite, tochilinite, pyrrhotite, kamacite. Geochemistry: (A. Love, App) Olivine: Type I chondrules Fa0.9±0.7 (Fa0.3-2.2), N=6; Type II chondrules Fa39.9±15.2 (Fa16.7-63.4), N=14 Low Ca-pyroxene: Fs2.3±1.7Wo1.4±1.1(Fs1.1-5.4Wo0.2-3.5, N=10). Classification: Carbonaceous chondrite (CM2)/ Based on matrix abundance, chondrule size and mineralogy this is a CM2. Specimens: PARI holds the main mass. One endcut weighing 9.3 g and a polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016) |
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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) | ||||||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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