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Northwest Africa 5151
Basic information Name: Northwest Africa 5151
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5151
Observed fall: No
Year found: 2007
Country: Algeria
Mass:help 289 g
Meteoritical Bulletin:  MB 94  (2008)  Lunar feldspathic breccia
Recommended:  Lunar    [explanation]

This is 1 of 99 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 3 Sep 2008
Writeup from MB 94:

Northwest Africa 5151


Find: 2007

Achondrite (lunar, feldspathic breccia)

History and physical characteristics: A 289 g stone was purchased in Rissani, Morocco, in 2007. The exterior is reddish-brown to dark gray with minor, translucent residual fusion crust.

Petrography: (J. Wittke and T. Bunch, NAU) The fragmental to melt matrix contains abundant breccia-within-breccia clasts together with typical highlands lithic components that mostly include anorthosites, noritic and troctolitic anorthosites, troctolites (olivine >40 vol%), gabbros, granulites, cataclastic breccias, shock melt clasts, in addition to mare basalt clasts and mineral fragments. Several small to mm-size metal globules are scattered throughout the matrix. Numerous dark brown, shock-melt veins are present along large clast margins. Interior weathering grade is very low with no apparent alteration veins.

Mineral compositions: Noritic anorthosite orthopyroxene is Fs24.4Wo3.8 (FeO/MnO = 60), plagioclase = An94.2. Gabbro olivine is Fa34.1 (FeO/MnO = 97), plagioclase is An88.1, pigeonite is Fs27.9Wo9.2 (FeO/MnO = 55), chromite Cr/ (Cr + Al) = 0.65 and Ni in metal is 5.8 to 6.6 wt%.

Bulk chemistry (R. Korotev, WUSL): Na2O = 0.478 wt%; Sc = 16.7 ppm, Cr = 1440 ppm; FeO = 8.52 wt%; Ni = 171 ppm; Ba = 183 ppm; Th = 1.76 ppm.

Classification: Achondrite (lunar feldspathic breccia).

Type specimen: A total of 20.3 g is on deposit at NAU. The main mass holder is anonymous.

Data from:
  Table 2
  Line 92:
Mass (g):289
Class:Lunar feldspathic breccia
Shock stage:Low
Fayalite (mol%):34.1
Ferrosilite (mol%):24.4, 27.9
Wollastonite (mol%):3.8, 9.2
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):20.3
Type spec location:NAU
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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     This is 1 of 1232 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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