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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 107 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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 147 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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