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Northwest Africa 14585
Basic information Name: Northwest Africa 14585
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14585
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 331 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 421 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 19 Mar 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14585 (NWA 14585)

(Northwest Africa)

Purchased: 2021 Jun

Classification: HED achondrite (Howardite)

History: Purchased by Bala Adi from several Algerian dealers and acquired by Jason Whitcomb in June 2021.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Complex metal-bearing breccia consisting of silicate clasts of varying size set in a much finer grained, partly vesicular matrix containing kamacite, troilite and ilmenite (all three as composite grains). Silicate grains include diogenitic orthopyroxene, diogenitic olivine, eucritic pigeonite, bytownitic plagioclase and anorthite. The proportions of diogenitic and eucritic material are dfiicult to estimate accurately, but certainly exceed 10 vol.% each. Silica polymorph, augite, chromite and Fe metal were not observed in the studied slice, but a single 250 ┬Ám zoned glass sphere with diogenitic orthopyroxene-like core and pigeonite-like rim was found.

Geochemistry: Diogenitic orthopyroxene ( Fs27.4Wo1.0; FeO/MnO = 25-37; N = 2), pigeonite (Fs32.2-35.9Wo8.4-15.5, FeO/MnO = 28-34, N = 4), ferroan pigeonite rim (Fs48.4Wo6.2, FeO/MnO = 28), olivine (Fa41.6-52.5, FeO/MnO = 49-56, N = 3), olivine inclusion in diogenitic orthopyroxene (Fa31.2, FeO/MnO = 45), plagioclase (An82.3-92.5Or0.7-0.2, N = 3), glass sphere core (Fs17.8Wo2.3, FeO/MnO = 37, Al2O3 2.0 wt.%).

Classification: Howardite, melt breccia (vesicular).

Specimens: 26.4 g in the form of a polished slice at PSF; remainder with Mr. J. Whitcomb.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021 Jun
Mass (g):331
Pieces:2
Class:Howardite
Shock stage:high
Weathering grade:low
Fayalite (mol%):31.2-52.5
Ferrosilite (mol%):17.8; 27.4; 32.2-35.5; 48.4
Wollastonite (mol%):2.3; 1.0; 8.4-15.5; 6.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):26.4
Type spec location:PSF
Main mass:J. Whitcomb
Comments:Work name BA-01; submitted by A. Irving
Institutions
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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