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Northwest Africa 14459
Basic information Name: Northwest Africa 14459
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14459
Observed fall: No
Year found: 2021
Country: Niger
Mass:help 363 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 363 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Nov 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14459 (NWA 14459)

Niger

Purchased: 2021 Jan

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Mbark Arjdal in January 2021 from a dealer in Niger.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Highly shocked polymict breccia composed predominantly of angular mineral fragments derived from eucrite lithologies, plus sparse lithic gabbroic eucrite clasts and <10 vol.% diogenitic orthopyroxene grains (exhibiting highly undulose extinction and with a substantial range in compositions). The eucritic minerals are calcic plagioclase, exsolved pigeonite (some polycrystalline), silica polymorph, fayalite, chromite, Fe metal and troilite. A single 0.5 mm grain of forsteritic olivine is also present in the studied thin section, as well as several thin shock melt veins. Much of the plagioclase occurring as isolated grains and within lithic eucrite clasts exhibits a microspherulitic texture implying rapid quenching from a molten state.

Geochemistry: Diogenitic orthopyroxene (Fs22.8-30.6Wo1.1-3.1, FeO/MnO = 24-33, N = 9; Fs32.1-37.3Wo2.6-4.9, FeO/MnO = 26-31, N = 4), pigeonite hosts (Fs32.5-52.5Wo6.4-9.1, FeO/MnO = 26-30, N = 4), augite exsolution lamellae (Fs30.5-32.2Wo39.7-41.3, FeO/MnO = 27-31, N = 2), fayalite (Fa80.5-90.9, FeO/MnO = 45-53, N = 4), forsterite (Fa8.0, FeO/MnO = 35), plagioclase (An88.8-93.6Or0.8-0.1, N = 2).

Classification: Eucrite (polymict breccia, highly shocked).

Specimens: 25.8 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Niger
Date:P 2021 Jan
Mass (g):363
Pieces:1
Class:Eucrite-pmict
Shock stage:high
Weathering grade:low
Fayalite (mol%):80.5-90.9
Ferrosilite (mol%):22.8-28.6; 30.6-37.3; 30.5-32.2; 32.5-52.5
Wollastonite (mol%):1.3-3.1; 1.1-4.9; 39.7-41.3; 6.4-9.1
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):25.8
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZA 5; 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. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Niger
Coordinates:Unknown.

Statistics:
     This is 1 of 80 approved meteorites from Niger (plus 3 unapproved names)

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