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Northwest Africa 6817
Basic information Name: Northwest Africa 6817
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6817
Observed fall: No
Year found: 2011
Country: Western Sahara
Mass:help 1131 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 372 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 26 May 2011
Writeuphelp
Writeup from MB 99:

Northwest Africa 6817 (NWA 6817)

Western Sahara

Found: 2011

Classification: HED achondrite (Howardite)

History: Found in Western Sahara in 2011, purchased by Jay Piatek and A. Habibi in Erfoud, Morocco, April 2011.

Physical characteristics: Total mass 1131 g. Partially covered with smooth fusion crust. Full-slice reveals many centimeter- to submillimeter-sized light-colored clasts and numerous dark clasts (<1 to 3 mm) set in a light blue-gray, fine-grained matrix. One thin dark melt vein.

Petrography: (C. Agee, UNM) Microprobe examination shows two populations of low-Ca pyroxene: ~75% eucritic and ~25% diogenitic. Augite present as exsolution lamellae primarily in eucritic pyroxenes. Total pyroxene volume ~50%, plagioclase feldspar ~40%. Silica phase, ilmenite, chromite, and troilite present. Olivine and Fe,Ni-metal absent. Larger clasts often coarse grained poikilitc pyroxene and plagioclase, some large clasts are poikilitc plagioclase, silica, pyroxene, and troilite, other clasts are very fine grained mosaics of pyroxene and plagioclase.

Geochemistry: (C. Agee and M. Spilde, UNM) Two distinct low-Ca pyroxene populations: Fs60.0±4.0Wo2.3 ±0.7 Fe/Mn=31±1, N=14 (eucritic), Fs29.1±6.2Wo3.0±1.9 Fe/Mn=31±2, N=7 (diogenitic), augite: Fs26.0±1.7Wo43.7±0.7 Fe/Mn=31±1, N=11, plagioclase Or0.6±0.1Ab10.8±0.6An88.7±0.7.

Classification: Achondrite (howardite): light surface weathering, fresh cut surface has minimal weathering, moderate shock grade.

Specimens: 50 g on deposit at UNM, J. Piatek and AHabibi each hold approximately half of the main mass.

Data from:
  MB99
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:2011
Mass (g):1131
Pieces:1
Class:Howardite
Ferrosilite (mol%):60.0±4.0, 29.1±6.2, 26.0±1.7
Wollastonite (mol%):2.3±0.7, 3.0±1.9, 43.7±0.7
Classifier:C. Agee, UNM
Type spec mass (g):50
Type spec location:UNM
Main mass:Piatek, Habibi
Comments:Submitted by C. Agee
Institutions
   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)
AHabibi: Palms Hotel Club, Erfoud 52200, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Institute of Meteoritics UNM   
Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 204 approved meteorites from Western Sahara (plus 20 unapproved names)

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