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Northwest Africa 2651
Basic information Name: Northwest Africa 2651
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2651
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass:help 89 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 516 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 28 Mar 2007
Writeuphelp
Writeup from MB 91:

Northwest Africa 2651

Northwest Africa

Find: 2003

Achondrite (ureilite)

History and physical characteristics: An 89 g partial stone was purchased in Erfoud, Morocco, in May 2004. Petrography: (J. Wittke and T. Bunch, NAU) Bi-modal ureilite that contains scarce, large pigeonite grains (up to 8 mm in diameter) heterogeneously distributed throughout an equigranular, fine-grained (<0.9 mm) matrix of olivine and compositionally similar low-Ca pyroxene. Olivine is highly fractured with closely spaced, subparallel fractures normal to [001]. Grain edges have a saw-tooth appearance of alternating, more-reduced rims together with deposits of carbonaceous-metal-silicate-masses that permeated fractures and less-reduced rims that are between fractures, similar to NWA 2624.

Mineral compositions and geochemistry: Olivine (cores = Fa18.6, rims = Fa10.7–14.3), small pigeonite (Fs16.8Wo2.9–3.8), large pigeonite (Fs15.1Wo3.3), metal (Ni = <0.63 wt%).

Classification: Achondrite (ureilite); S2, minimal weathering. This sample is potentially paired with NWA 2624.

Type specimen: A total of 22.6 g and one thin section are on deposit at NAU. Reed holds the main mass.

Data from:
  MB91
  Table 2
  Line 111:
Place of purchase:Erfoud, Morocco
Date:2003
Mass (g):89
Pieces:1
Class:Ure
Shock stage:S2
Weathering grade:minimal
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):22.6
Type spec location:NAU
Main mass:Reed
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Rob Wesel   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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