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Northwest Africa 2976
Basic information Name: Northwest Africa 2976
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2976
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 219 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 103 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 1 Sep 2006
Writeuphelp
Writeup from MB 91:

Northwest Africa 2976

Northwest Africa

Find: 2005

Achondrite (ungrouped)

History and physical characteristics: A complete 219 g stone with no crust was purchased in Erfoud, Morocco, in November 2005.

Petrography: (T. Bunch and J. Wittke, NAU) Contains millimeter-size pigeonite with exsolved augite lamellae surrounded by recrystallized plagioclase and minor amounts of relict plagioclase of similar composition.

Mineral composition: Pigeonite (Fs64.8Wo6.1), FeO/MnO = 64; augite (Fs44.2Wo27.3); plagioclase (An84.0–86.8). Abundant chromite is observed. The sample also contains minor amounts of Zn-bearing FeS, Cr-ulvöspinel, silica, and phosphate.

Classification: Achondrite (ungrouped); minimal shock and weathering. This meteorite is paired with NWA 2400 and NWA 011. Although no oxygen isotopic data have yet been obtained, the petrography is essentially identical to these two meteorites.

Type specimen: A 23.2 g sample is on deposit at NAU. MFarmer and Strope hold the main mass.
NWA 2976

The polished cut surface of a hand sample of NWA 2976, with the longest axis ~4 cm.

Data from:
  MB91
  Table 2
  Line 141:
Place of purchase:Erfoud, Morocco
Date:2005
Mass (g):219
Pieces:1
Class:Aung
Shock stage:S1
Weathering grade:minimal
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):23.2
Type spec location:NAU
Main mass:MFarmer
Institutions
   and collections		 NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
Strope: 421 Fourth Street, Glen Dale, WV 26038, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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)
David Hardy   
Jim Strope   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7688 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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