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Northwest Africa 14975
Basic information Name: Northwest Africa 14975
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14975
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 250 g
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 5 Jul 2022
Writeup from MB 111:

Northwest Africa 14975 (NWA 14975)

(Northwest Africa)

Purchased: 2021 Aug

Classification: HED achondrite (Howardite)

History: Purchased by Jason Whitcomb in August 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU). Complex breccia composed of lithic clasts and crystalline debris from several different sorts of eucrites and ~25-30 vol.% diogenite material. Textures of eucrite clasts range from gabbroic to diabasic to fine intersertal, and their major constituent pyroxenes (both exsolved and unexsolved pigeonite) and calcic plagioclase range widely in composition. Accessory phases include augite, silica polymorph, ilmenite, troilite, fayalite and chromite. Diogenitic orthopyroxene also ranges widely in composition and some lithic diogenite clasts contain accessory olivine. - brecciated, clastic - metamorphic and gabbro clasts - diogenite component present, probably 25-30% area

Geochemistry: Diogenitic orthopyroxene (Fs21.0-29.5Wo2.5-4.1; Fs33.8-35.7Wo3.6-4.6; FeO/MnO = 28-30, N = 6), eucrite low-Ca pyroxene (Fs43.4-51.5Wo1.9-5.8, FeO/MnO = 29-35, N = 4), pigeonite (Fs35.5-39.0Wo6.1-7.3; Fs49.0-49.9Wo12.1-14.8; FeO/MnO = 27-32; N = 5), subcalcic augite (Fs36.4Wo24.0; Fs50.9Wo22.2; FeO/MnO = 29, N = 2), augite (Fs13.2Wo44.6, FeO/MnO = 21), fayalite (Fa71.7-76.3, FeO/MnO = 42-43, N = 2), plagioclase (An81.5-92.5Or0.7-0.2, N = 3).

Classification: Howardite.

Specimens: 21.0 g including one polished thin section at PSF; remainder with Mr. J. Whitcomb.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021 Aug
Mass (g):250
Shock stage:low
Weathering grade:low
Fayalite (mol%):71.7-76.3
Ferrosilite (mol%):21.0-35.7; 43.4-51.5; 35.5-39.0; 49.0-49.9; 13.2
Wollastonite (mol%):2.5-4.6; 1.9-5.8; 6.1-7.3; 12.1-14.8; 44.6
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):21.0
Type spec location:PSF
Main mass:J. Whitcomb
Comments:Work name JW-80; submitted by A. Irving
   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)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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