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Northwest Africa 8617
Basic information Name: Northwest Africa 8617
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8617
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 327 g
Meteoritical Bulletin:  MB 103  (2014)  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 23 Nov 2014
Writeup from MB 103:

Northwest Africa 8617 (NWA 8617)

(Northwest Africa)

Purchased: 2014

Classification: HED achondrite (Howardite)

History: Purchased by Habib Naji in Guelmin, Morocco, October 2014.

Physical characteristics: Single stone, weathered exterior, partial fusion crust, broken surface reveals a fresh-looking breccia of fine-grained light and dark clasts set in light gray matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a highly brecciated texture with ~60% diogenitic pyroxenes, ~20% equilibrated cumulate eucrite pyroxenes, and ~20% equilibrated basaltic eucrite pyroxenes. Accessory Fe-Ni metal, troilite, chromite, silica, and ilmenite throughout.

Geochemistry: (C. Agee and N. Muttik, UNM) Diogenite orthopyroxene Fs28.1±2.7Wo2.5±0.7, Fe/Mn=32±2, n=24; cumulate eucrite low-Ca pyroxene Fs41.9±2.1Wo4.1±1.4, Fe/Mn=27±1, n=5, cumulate eucrite augite Fs23.9Wo29.7, Fe/Mn=29, n=1; basaltic eucrite low-Ca pyroxene Fs53.7±4.4Wo6.3±2.8, Fe/Mn=28±2, n=3; basaltic eucrite augite Fs29.4±3.0Wo39.3±2.8, Fe/Mn=32±1, n=5; olivine Fa35.4, Fe/Mn=54, n=1; plagioclase An87.8±4.5Ab11.5±4.2Or0.7±0.3, n=14.

Classification: Achondrite (howardite) with three lithologies: 1) diogenite, 2) equilibrated cumulate eucrite, 3) equilibrated basaltic eucrite. Low weathering grade, high shock stage.

Specimens: 20.1 g including a probe mount on deposit at UNM, H. Naji holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Guelmin, Morocco
Date:P 2014
Mass (g):327.3
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):28.1±2.7, 41.9±2.1, 53.7±4.4
Wollastonite (mol%):2.5±0.7, 4.1±1.4, 6.3±2.8
Classifier:C. Agee, UNM
Type spec mass (g):20.1
Type spec location:UNM
Main mass:Habib Naji
Comments: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)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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