|Northwest Africa 2995|
|Basic information||Name: Northwest Africa 2995|
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2995
Observed fall: No
Year found: 2005
Mass: 538 g
This is 1 of 98 approved meteorites classified as Lunar (feldsp. breccia). [show all]
Search for other: Lunar meteorites
Approved 16 Jan 2006|
Revised 3 Feb 2006: Revised writeup
Writeup from MB 90:
Northwest Africa 2995
Achondrite (lunar feldspathic breccia)
History: A 538 g fully crusted and minimally weathered stone was purchased in Morocco by A. Aaronson in November 2005.
Petrography and Geochemistry: (T. Bunch and J. Wittke, NAU) The feldspathic fragmental breccia contains many highlands fine-grained lithologies. Norite: Orthopyroxene (Fs26.4Wo4; FeO/MnO = 66). Olivine basalt: Olivine (Fa87.2; FeO/MnO = 95), plagioclase (An84.7). Subophitic basalt: Ca pyroxene (Fs25–48Wo37.1–25.9), pigeonite (Fs27.8–31.7Wo15.4–9.3; FeO/MnO = 53), olivine (Fa36.3; FeO/MnO = 90), plagioclase (An97). Gabbro: Olivine (Fa34.7; FeO/MnO = 95), pigeonite (Fs28.2Wo8.9; FeO/MnO = 67), plagioclase (An94). KREEPy-like basalt: Plagioclase (Ab50Or17.4), K feldspar (Ab14.3Or83) in addition to silica, phosphate, and Fe-rich pyroxenes. Troctolite: olivine (Fa30.8; FeO/MnO = 94), plagioclase (An94.7). Granulitic impact melts: Olivine (Fa31), orthopyroxene (Fs25.2Wo3.4), plagioclase (An95). Anorthosite: (An92.7–96.8), glassy impact melts, coarse-grained mineral fragments, and a 0.350 mm-size grain of meteoritic Ni, Fe-metal (Ni = 6.3, Co = 1.0 [both wt%]). In addition, the assemblage appears to be characterized by large amounts of breccias within breccias with at least four generations of brecciation observed in one centimeter-size breccia clast. Numerous shock-induced melt veins are present along large breccia clast margins as well as isolated melt pockets within clasts. Interior weathering grade is very low, all glasses are fresh, and no apparent terrestrial alteration veins were noted.
Classification: Achondrite (lunar, feldspathic breccia).
Specimens: A 21.2 g type specimen is on deposit at NAU. Aaronson holds the main mass.
NAU: Geology, Bldg 12
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
|References:||Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)|
This is 1 of 726 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)
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