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Northwest Africa 13307 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13307 This is an OFFICIAL meteorite name. Abbreviation: NWA 13307 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: 467 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 142 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 13 Jun 2020 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13307 (NWA 13307) (Northwest Africa) Purchased: 2020 Apr Classification: Ungrouped achondrite History: Found in Mauritania, purchased by Rachid and Jaouad Chaoui in March 2020 from a Mauritanian dealer and subsequently sold to Luc Labenne. Physical characteristics: A single stone (467 g) partly coated by black fusion crust. The fresh interior is a friable aggregate of colorless to pale gray, equant grains. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Protogranular aggregate (mean grainsize ~1.2 mm) composed predominantly of subequal amounts of diopside and enstatite with minor accessory daubreelite, ferroan alabandite and Ti-Cr-bearing troilite. Both pyroxenes exhibit fine, blebby and irrational exsolution of the other pyroxene phase, and also contain patchy, compositionally different domains. No metal or olivine was observed despite a diligent search. Geochemistry: Enstatite (Fs0.2±0.0Wo1.7-4.5, FeO/MnO = 0.3, N = 3), diopside (Fs0.1±0.0Wo39.7-40.5, FeO/MnO = 0.2, N = 2), homogeneous low-Ca pyroxene domain within diopside (Fs0.2Wo8.3, FeO/MnO = 0.3). Classification: Achondrite (ungrouped, magnesian websterite, reduced). Specimens: 22.2 g including two polished thin sections at UWB; remainder held jointly by Mr. R. Chaoui and Mr. J. Chaoui. Writeup from MB 113: NWA 13307: correction and additional data
The main mass owner stated in the text of MB109 was incorrect. It is Labenne. Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 2.794, 2.904, 2.811; δ18O 5.374, 5.552, 5.405; Δ17O -0.043, -0.027, -0.043 per mil (all data linearized, TFL slope = 0.528). | ||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||
Institutions and collections |
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) WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020) Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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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: |
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