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Northwest Africa 2976 | |||||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||||
Classification history: |
This is 1 of 125 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||
Comments: | Approved 1 Sep 2006 | ||||||||||||||||||||||
Writeup![]() |
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. The polished cut surface of a hand sample of NWA 2976, with the longest axis ~4 cm. | ||||||||||||||||||||||
Data from: MB91 Table 2 Line 141: |
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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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photos: |
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |