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Northwest Africa 13954
Basic information Name: Northwest Africa 13954
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13954
Observed fall: No
Year found: 2020
Country: Mauritania
Mass:help 4.5 kg
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 140 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 29 May 2021
Writeuphelp
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:
Place of purchase:Mauritania
Date:P 2020
Mass (g):4500
Pieces:1
Class:Achondrite-ung
Shock stage:high
Weathering grade:low
Fayalite (mol%):14.3±4.7
Ferrosilite (mol%):26.1±11.0, 11.9±9.1
Wollastonite (mol%):2.9±2.8, 40.7±7.2
Classifier:C. Agee, UNM
Type spec mass (g):20.2
Type spec location:UNM
Main mass:Jay Piatek
Comments:Submitted by C. Agee
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)
Catalogs:
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
Find references in NASA ADS:
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Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 212 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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