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Northwest Africa 10422
Basic information Name: Northwest Africa 10422
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10422
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 43.7 g
Meteoritical Bulletin:  MB 104  (2015)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 272 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Dec 2015
Writeup from MB 104:

Northwest Africa 10422 (NWA 10422)

(Northwest Africa)

Purchased: 2015

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Adam Aaronson in Morocco, 2015.

Physical characteristics: Fusion crusted exterior. Broken surface reveals a typical HED breccia with light and dark-gray clasts.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a mildly brecciated texture with approximately 60% pyroxene and 35% plagioclase. Many pyroxenes show distinct exsolution lamellae. Low-Ni iron metal, troilite, Ti-chromite, ilmenite and silica were observed. Some fine shock melt veins are present.

Geochemistry: (C. Agee and N. Muttik, UNM) Low-Ca pyroxene Fs65.5±0.5Wo2.1±0.3, Fe/Mn=32±1, n=6; high-Ca pyroxene Fs29.6±0.7Wo42.7±0.4, Fe/Mn=33±1, n=6; plagioclase An88.1±0.5, n=3.

Classification: Eucrite monomict. Equilibrated, with clear compositional separation of low-Ca and high-Ca pyroxene.

Specimens: 9 g including a probe mount on deposit at UNM, Aaronson holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2015
Mass (g):43.7
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):65.5±0.5, 29.6±0.7
Wollastonite (mol%):2.1±0.3, 42.7±0.4
Classifier:C. Agee, UNM
Type spec mass (g):9
Type spec location:UNM
Main mass:Aaronson
Comments:M1876; submitted by C. Agee
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
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 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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