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Northwest Africa 2650
Basic information Name: Northwest Africa 2650
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2650
Observed fall: No
Year found: 2004
Country: Morocco
Mass:help 2.22 kg
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 218 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Aug 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 2650 (NWA 2650)

Morocco

Find: 2004

Classification: HED achondrite (Eucrite, monomict)

History: A 2224 g complete stone that measures 189 mm × 112 mm × 82 mm at the widest points, with fresh crust was purchased in Erfoud, Morocco

Petrography: The meteorite has a texture of brecciated meteorite, with coarse-grained gabbro eucrite fragments and coarse-grained mineral fragments embedded in relatively fine-grained matrix composed of pyroxene and plagioclase fragments. Both shock-induced melt veins and pockets are observed. Mineralogically, this meteorite consists mainly of coarse-grained plagioclase (up to 7 mm) and pyroxenes (up to 5 mm). Other minerals include silica phase, chromite, ilmenite, troilite, and zircon. Almost all of the pyroxene grains exhibit exsolution lamella. Extensive albite, Carlsbad, and complex igneous twinning occur in plagioclase.

Geochemistry: The coarse-grained minerals in the coarse-grained gabbro eucrite fragments have compositions almost identical to those in the relatively fine-grained matrix. Orthopyroxene host (En37.2±0.7Fs60.1±1.5Wo2.7±1.3, Fe/Mn=29.9±0.7 n=14), augite exsolution lamella (En29.7±0.4Fs26.4±0.5Wo43.9±0.5, Fe/Mn=29.8±1.8, n=14), plagioclase (An90.5±1.5Ab9.2±1.4, n=17), and chromite (Cr/(Cr+Al)=0.79±0.01, n=8).

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:2004
Mass (g):2224
Pieces:1
Class:Eucrite-mmict
Classifier:T. Bunch and J. Wittke, NAU; Aicheng Zhang, NU
Type spec mass (g):23.1
Type spec location:ROM
Main mass:D. Schultz
Comments:Submitted by Aicheng Zhang
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
NU: School of Earth Sciences and Engineering, Nanjing University, #163 Xianlin Avenue, Nanjing 210023, China, China (institutional address; updated 18 Jul 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Mike Farmer      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Gerald Armstrong   
Public domain photographs:
NWA 2650   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1390 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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