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Northwest Africa 12416 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12416 This is an OFFICIAL meteorite name. Abbreviation: NWA 12416 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 875 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 31 approved meteorites classified as C3-ung. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 27 Jul 2019 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12416 (NWA 12416) (Northwest Africa) Purchased: 2018 Jul Classification: Carbonaceous chondrite (C3, ungrouped) History: The first batch of this material was purchased by Adam Aaronson in July 2018 in Temara, Morocco; subsequently additional material was purchased from the same Moroccan source by Mark Lyon and others. Physical characteristics: The material consists of numerous small black, friable stones, some completely fusion crusted (total weight 875 g). Petrography: (A. Irving and S. Kuehner, UWS; L. Garvie, ASU) Granular chondrules (apparent diameter 350±210 µm, N = 15) together with sparse mineral fragments and AOA (but no identifiable CAI or related mineral grains) are set in very fine grained matrix (~50 vol.%, black in thin section) containing minor kamacite and pentlandite. No phyllosilicates were detectable by X-ray diffraction. Geochemistry: Olivine (Fa1.0-67.1, N = 3), orthopyroxene (Fs1.7-4.3Wo0.9-3.1, N = 2), clinopyroxene (Fs1.1Wo23.2). Oxygen isotopes (K. Ziegler, UNM) Analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O -10.290, -0.181, -11.117; δ18O -6.827, 7.352, -7.023; Δ17O -6.685, -4.063, -7.409 per mil. Classification: Carbonaceous chondrite (ungrouped Type 3). Oxygen isotope compositions plot at more negative Δ17O values than for CV, CK and most CM chondrites, and the absence of phyllosilicates excludes affinity to typical CM2 chondrites. Specimens: 20.1 g including one polished thin section at UWB; 152 g at ASU; 361 g with Mr. M. Lyon; 137 g with Mr. M. Ouzillou; 205 g with Mr. A. Aaronson. | ||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
Institutions and collections |
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012) UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Photos: |
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||||
Crosslinks: |
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Revision history: |
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