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Northwest Africa 14589
Basic information Name: Northwest Africa 14589
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14589
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 374 g
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 118 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 17 Apr 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14589 (NWA 14589)

(Northwest Africa)

Purchased: 2021 Jul

Classification: Ungrouped achondrite

History: Purchased by Matthew Stream in July 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Breccia composed predominantly (>90 vol.%) of deformed magnesian olivine grains (up to 1.7 cm in size) together with much smaller angular grains of orthopyroxene, diopside, calcic plagioclase, pigeonite (containing ~10 µm diopside inclusions), chromite (with variable Fe/Mg and Al/Cr ratios), pentlandite, troilite, merrillite and stained Fe metal. Olivine grains exhibit multiple internal tilt boundaries, and contain abundant inclusions of troilite, Fe metal and chromite.

Geochemistry: Olivine (Fa11.7-16.3, FeO/MnO = 40-43, N = 11), orthopyroxene (Fs14.2-14.7Wo3.1-4.6, FeO/MnO = 22-25, N = 9), pigeonite (Fs12.6Wo12.9, FeO/MnO = 22), diopside (Fs7.5-7.7Wo40.7-40.6, FeO/MnO = 17-18, N = 2), plagioclase (An86.7-92.9Or0.8-0.2, N = 6).

Classification: Ungrouped achondrite (dunitic breccia, magnesian). Although the mafic silicates in this specimen have FeO/MnO ratios in the ranges for diogenites and mesosiderites, they are much more magnesian than the corresponding phases in those achondrites. This specimen bears some textural and mineralogical resemblance to ungrouped olivine-rich breccias NWA 12217, NWA 12319 and NWA 12562 (Vaci et al., 2021), but in detail there are differences (notably the much more calcic plagioclase in this specimen), so pairing with any of those specimens is excluded.

Specimens: 23.6 g including one polished thin section at UWB; remainder with Mr. M. Stream.  

Bibliography:
  • Vaci Z., Day J. M. D., Paquet M., Ziegler K., Yin Q.-Z., Dey S., Miller A., Agee C., Bartoschewitz R. and Pack A. (2021) Olivine-rich achondrites from Vesta and the missing mantle problem. Nature Communications 12, 5443 (link)
Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021 Jul
Mass (g):373.9
Pieces:8
Class:Achondrite-ung
Shock stage:low
Weathering grade:low
Fayalite (mol%):11.7-16.3
Ferrosilite (mol%):14.2-14.7; 7.5-7.7
Wollastonite (mol%):3.1-4.6; 40.7-40.6
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):23.6
Type spec location:UWB
Main mass:M. Stream
Comments:Work name MS21-3; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
A. Irving      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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