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Northwest Africa 12543
Basic information Name: Northwest Africa 12543
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12543
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 235 g
Meteoritical Bulletin:  MB 108  (2020)  Winonaite
Recommended:  Winonaite    [explanation]

This is 1 of 89 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 31 Mar 2019
Writeup from MB 108:

Northwest Africa 12543 (NWA 12543)

Northwest Africa

Purchased: 2019

Classification: Primitive achondrite (Winonaite)

History: Reportedly found June 2018, purchased by Zuokai Ke in February 2019 from a Moroccan meteorite dealer.

Physical characteristics: Single stone, dark color, partial fusion crust on exterior. Saw-cut surfaces shows scattered fine-grained metal set in a mosaic of dark colored silicate minerals.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a texturally equilibrated mosaic of forsterite, enstatite, and diopside with grain size in the range 100-300 μm, many triple junctions are present. Fe-Ni metal makes up approximately 5-10% of this meteorite, most grains are 100-300 μm in diameter, there are also fine veinlets of metal or Fe-oxide throughout. No feldspar was observed.

Geochemistry: (C. Agee UNM) Forsterite Fa0.6±0.1, Fe/Mn=4±1, n=6; enstatite Fs1.1±0.2Wo1.8±0.2, Fe/Mn=2±0, n=3; diopside Fs1.0±0.6Wo47.0±0.6, Fe/Mn=2±1, n=3. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O=4.662, 5.118, 5.583; δ17O=1.88, 2.12, 2.345; Δ17O=-0.582, -0.582, -0.603 (linearized, all per mil, TFL slope=0.528).

Classification: Primitive achondrite (winonaite) based on presence of near-end member magnesian silicates and oxygen isotope values that coincide with the winonaite field.

Specimens: 24 g including a probe mount on deposit at UNM, Zuokai Ke holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):234.5
Shock stage:low
Weathering grade:low
Fayalite (mol%):0.6±0.1
Ferrosilite (mol%):1.1±0.2, 1.0±0.6
Wollastonite (mol%):1.8±0.2, 47.0±0.6
Classifier:C. Agee, UNM
Type spec mass (g):24
Type spec location:UNM
Main mass:Zuokai Ke
Comments:Submitted by C. Agee
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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