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Northwest Africa 13954 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13954 This is an OFFICIAL meteorite name. Abbreviation: NWA 13954 Observed fall: No Year found: 2020 Country: Mauritania Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 140 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 29 May 2021 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 110:
Northwest Africa 13954 (NWA 13954) Mauritania Purchased: 2020 Classification: Ungrouped achondrite History: Purchased by Jay Piatek in 2020 from Mauritania. Physical characteristics: Single stone, partially covered with black fusion crust. The exposed interior is a fragmental breccia with coarse light-green to cream-colored grains. Scattered oxidized metal grains are visible throughout. Petrography: (C. Agee, UNM) Backscatter electron images give the approximate modal abundances: 90% olivine, 5% pyroxene, with minor chromite, troilite, and taenite. Olivine grains up to cm size. Geochemistry: (C. Agee, UNM) Olivine Fa14.3±4.7, Fe/Mn=42±4, n=19; low-Ca pyroxene Fs26.1±11.0Wo2.9±2.8, Fe/Mn=29±2, n=7; augite Fs11.9±9.1Wo40.7±7.2, Fe/Mn=19±5, n=3. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O= 3.039, 3.405, 3.194; δ17O= 1.392, 1.587, 1.446; Δ17O= -0.213, -0.211, -0.240 (linearized, all per mil, TFL slope=0.528). Classification: Ungrouped achondrite, dunite breccia. The oxygen isotope values of this meteorite plot above the Δ17O eucrite fractionation line (EFL) and its mineralogy is unlike HEDs in that it is a dunite. Similar to NWA 12217, possibly paired with NWA 12562 and NWA 12319. Specimens: 20.2 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB110 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) |
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Catalogs: |
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References: | Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:![]() |
Statistics: This is 1 of 212 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) |