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Northwest Africa 10175
Basic information Name: Northwest Africa 10175
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10175
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 823 g
Meteoritical Bulletin:  MB 104  (2015)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 427 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 3 Oct 2015
Writeup from MB 104:

Northwest Africa 10175 (NWA 10175)

(Northwest Africa)

Purchased: 2015 Feb

Classification: HED achondrite (Howardite)

History: Purchased by Darryl Pitt in February 2015 from a dealer in Mauritania.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh fragmental breccia composed mainly of angular mineral clasts plus a variety of lithic clasts (basaltic eucrite, eucritic breccia) set in a finer grained matrix. Minerals comprise compositionally zoned, diogenitic orthopyroxene (~15 vol.%), exsolved pigeonite, calcic plagioclase, silica polymorph, Ti-poor chromite, ilmenite, zircon, troilite and altered Ni-free metal.

Geochemistry: Orthopyroxene 1 (Fs18.1Wo1.1, FeO/MnO = 31), zoned orthopyroxene 2 (core Fs24.8Wo2.2, rim Fs45.8Wo2.0, FeO/MnO = 31-33), orthopyroxene host 1 (Fs55.6Wo2.67, FeO/MnO = 27), clinopyroxene exsolution lamella 1 (Fs25.8Wo41.0, FeO/MnO = 25), orthopyroxene host 2 (Fs49.7Wo2.4, FeO/MnO = 32), clinopyroxene exsolution lamella 2 (Fs21.6Wo43.3, FeO/MnO = 32).

Classification: Howardite based on the presence of ~15 vol% of diogenitic orthopyroxene.

Specimens: 20.3 g including one polished thin section at UWB. The remainder is held by DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2015 Feb
Mass (g):822.8
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):18.1; 24.8; 55.6; 25.8; 49.7; 21.6
Wollastonite (mol%):1.1; 2.2; 2.6; 41.0; 2.4; 43.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.3
Type spec location:UWB
Main mass:D. Pitt
Comments:MAC 118; submitted by A. Irving
   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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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