kasbah.jpg (6568 bytes) Northwest Africa 2977

a piece of the moon from the exotic Sahara Desert

 

 
  • NWA 2977 is a lunar gabbro meteorite that contains two pyroxenes, olivine, plagioclase shocked to maskelynite, K, Ba feldspar, and various Cr, Fe, Ti oxides. This cumulate lunar rock (cumulate = accumulation of crystals by gravity settling in a magma) probably originated in the lunar highlands environment as a thick lava flow or as a shallow intrusive into the highlands crust. After formation, the gabbro was moderately shocked by hypervelocity impact.


     

    Official Classification from Meteoritical Society Data Base

    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 M. Farmer 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, thin veins.  It is an olivine-rich, two-pyroxene cumulate gabbro composed of olivine 51%, Fa31.7, FeO/MnO = 96; pigeonite 23%, Fs26.6Wo6.7; augite 9%, Fs16.2Wo29; plagioclase 14%, An56 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 to 0.125 mm).  Plagioclase is partially converted to maskelynite, and pyroxenes and olivine exhibit shock lamellae and undulatory extinction.  Noteworthy This specimen is identical in texture and mineral compositions to the gabbro clasts in NWA 773 and NWA 2700 and thus appears to be paired with those breccia specimensClassification: Achondrite (Lunar gabbro) with minor weathering.  Specimens: A 20.1 g 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.

 

Abstract submitted for presentation as poster at the LPSC in Houston in March, 2006.  PDF document. requires an Acrobat Reader (it is free):

LUNAR METEORITES NWA 2700, NWA 2727, AND NWA 2977: MARE BASALT/GABBRO BRECCIAS WITH AFFINITIES TO NWA 773.  T. E. Bunch, J. H. Wittke, R. L. Korotev, and A. J. Irving, Dept. of Geology, Northern Arizona University, Flagstaff, AZ 86011, Dept. of Earth & Planetary Sciences, Washington University, St. Louis, MO 63130, Dept. of Earth & Space Sciences, University of Washington, Seattle, WA  98195

 

lunarwholea.jpg (301379 bytes)

233 gram meteorite before cutting.

19.4 gram main mass endcut.   Now part of the Royal Ontario Museum collection:

Click images to enlarge:

nwa2977mainmass.jpg (185745 bytes)   nwa297719a.JPG (179787 bytes)  nwa297719b.JPG (212664 bytes)

Cut face measures 44.3mm by 22.5mm.  Depth of endcut is 17.9mm

 

Specimens available for sale:

 

Each specimen comes complete with a certificate of authenticity and an ID card.  Each specimen also comes packaged in a plastic display box from which the specimen can easily be removed as shown. -

 

Click Images to enlarge:               All photos and text are copyright and may not be used without permission.
     

.080 gram partslice.  Measures 6.2 mm by 4.2 mm by 1.0 mm thick.   Measurements taken at widest point.  - SOLD

nwa2977142a.JPG (132710 bytes)  nwa2977142b.jpg (47939 bytes)  nwa2977142c.JPG (102697 bytes)  

.142 gram partslice.  Measures 10.6 mm by 6.6 mm by 1.0 mm thick.  Measurements taken at widest point.  - $280-

nwa2977198a.jpg (118222 bytes)  nwa2977198b.jpg (123565 bytes)  nwa2977198c.JPG (203030 bytes)  

.198 gram partslice.  Measures 9.0 mm by 7.2 mm by .9 mm thick.   Measurements taken at widest point.  There is a small section of FUSION CRUST on one edge, 3 mm long.  - $390-

nwa2977232a.JPG (107871 bytes)  nwa2977232b.jpg (174175 bytes)  nwa2977232c.JPG (222928 bytes)  

.232 gram partslice.  Measures 9.5 mm by 7.4 mm by 1.1 mm thick.   Measurements taken at widest point.  - $460-

nwa2977280a.JPG (78770 bytes)  nwa2977280b.jpg (101302 bytes)  nwa2977280c.JPG (101701 bytes)  

.280 gram partslice.  Measures 16.3 mm by 6.9 mm by 1.0 mm thick.  Has beautiful, black fusion crust along the top edge.   Measurements taken at widest point.  - $560-

nwa2977324c.JPG (67509 bytes)  nwa2977324a.JPG (129949 bytes) nwa2977324b.JPG (91507 bytes)  

.324 gram partslice.  Measures 16.9 mm by 9.7 mm by .9 mm thick.  Measurements taken at widest point. - SOLD

nwa2977372a.JPG (272187 bytes)  nwa2977372b.jpg (184297 bytes)  nwa2977372c.JPG (215619 bytes)  

.372 gram partslice.  Measures 11.7 mm by 11.3 mm by 1.0 mm thick.   Measurements taken at widest point.  - $740-

nwa2977950a.JPG (107810 bytes)  nwa2977950b.jpg (183978 bytes)  nwa2977950c.JPG (202425 bytes)  

.95 gram partslice.  Measures 40.5 mm by 11.3 mm by 1.0 mm thick.  Has beautiful, black fusion crust along the top edge.   Measurements taken at widest point.  The entire top edge, as referenced in the second photo, is FUSION CRUSTED.  - $1900-

 

Each specimen comes with a Photographic Certificate of Authenticity and ID card.

http://www.catchafallingstar.com/images/ebay/nwa2977cert.jpg (65956 bytes)   Sample of Certificate of Authenticity.

http://www.catchafallingstar.com/images/ebay/nwa2977card.jpg (71908 bytes)   Sample of ID card.

 

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