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Northwest Africa 5207
Basic information Name: Northwest Africa 5207
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5207
Observed fall: No
Year found: 2007
Country: Morocco
Mass:help 101 g
Meteoritical Bulletin:  MB 94  (2008)  Lunar feldspathic breccia
Recommended:  Lunar    [explanation]

This is 1 of 102 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 3 Sep 2008
Writeup from MB 94:

Northwest Africa 5207


Find: 2007

Achondrite (lunar feldspathic breccia)

History and physical characteristics: A 101 g stone was purchased in Rissani, Morocco, in 2007 by A. Aaronson. The exterior is dark in color.

Petrography: (T. Bunch and J. Wittke, NAU) The fragmental matrix contains a wide variety of lithic, glassy, and shocked components that mainly include plagioclase-olivine orthocumulates, recrystallized noritic and troctolitic anorthosites, gabbros and course to fine-grained basalts, microbreccias, shock-melted lithologies, symplectites (from pyroxferroite decomposition), very sparse Apollo-like “green glasses” (A), and irregular-shaped light to dark green glasses (B), some of which are vesicular and contain tiny metalsulfide spherules. The interior weathering grade is very low.

Mineral/phase chemistry: Orthocumulate olivine, Fa26.5 (FeO/MnO = 96) and plagioclase, An99.3. Coarse-grained basalt olivine is Fa30; Ca-pyroxene core, Fs45.1Wo30.4 and rim, Fs62.7Wo16.8; plagioclase, An87.7. Fine-grained basalt olivine is Fa56.9 (FeO/MnO = 93); Ca-pyroxene, Fs28.5Wo34.7; plagioclase, An91.2. Green glasses (B) in wt%: SiO2 = 43.8; Al2O3 = 18.7; Cr2O3 = 0.50; TiO2 = 0.78; FeO = 12.5; MgO = 7.0; CaO = 15.2; K2O = 0.33 and Na2O = 0.58 (N = 17).

Bulk chemistry (R. Korotev, WUSL): Na2O = 0.484 wt%; Sc = 15.52 ppm; Cr = 1065 ppm; FeO = 7.56 wt%; Co = 26.7 ppm; Ni = 233 ppm; Th = 1.26 ppm and Ba = 123 ppm.

Classification: Achondrite (lunar, feldspathic breccia).

Type specimen: A total of 20 g is on deposit at NAU. The main mass holder is anonymous.

Data from:
  Table 2
  Line 96:
Mass (g):101
Class:Lunar feldspathic breccia
Weathering grade:Low
Fayalite (mol%):30, 56.9
Ferrosilite (mol%):28.5-02.7
Wollastonite (mol%):16.8-34.7
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):20
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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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     This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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