|Northwest Africa 2977|
|Basic information||Name: Northwest Africa 2977|
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2977
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 233 g
This is 1 of 8 approved meteorites classified as Lunar (gabbro). [show all]
Search for other: Lunar meteorites
Approved 16 Jan 2006|
Revised 3 Feb 2006: Revised writeup
Writeup from MB 90:
Northwest Africa 2977
Morocco or Algeria
Find: 2005 November
Achondrite (lunar, gabbro)
History: A single minimally weathered fusion-encrusted stone of 233 g was purchased from a Moroccan dealer in Tagounite, Morocco, by MFarmer in November 2005.
Petrography and Geochemistry: (J. Wittke and T. Bunch, NAU; A. Irving, UWS) The specimen consists of a single yellow-green, relatively coarse-grained rock traversed by thin, black glass-rich veins. It is an olivine-rich, two-pyroxene cumulate gabbro composed of olivine (Fa31.7; FeO/ MnO = 96; 52 vol%), (Fs26.6Wo6.7; 23 vol%), augite (Fs16.2Wo29; 9 vol%), and plagioclase (An56; 14 vol%) with minor amounts of Ba-K feldspar, chromite, ilmenite, and merrillite. Larger pigeonite grains commonly enclose equant olivine grains, which contain abundant melt inclusions (0.025–0.125 mm). Plagioclase is partially converted to maskelynite, and pyroxenes and olivine exhibit shock lamellae and undulatory extinction. Note: This specimen is identical in texture and mineral composition to the gabbro clasts in NWA 773 and NWA 2700 and thus appears to be paired with those breccia specimens.
Classification: Achondrite (lunar, gabbro); minimal weathering.
Specimens: A 20.1 g type specimen and one polished thin section are on deposit at NAU. A 0.5 g specimen is on deposit at WUSL. An anonymous owner holds the main mass.
NAU: Geology, Bldg 12
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
|References:||Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)|
This is 1 of 5725 approved meteorites from (Northwest Africa) (plus 2074 unapproved names)
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