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Northwest Africa 6950
Basic information Name: Northwest Africa 6950
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6950
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 1649 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Lunar (gabbro) 
Recommended:  Lunar (gabbro)    [explanation]

This is 1 of 8 approved meteorites classified as Lunar (gabbro).   [show all]
Search for other: Lunar meteorites
Comments: Approved 16 Dec 2011
Revised 29 Jan 2012: revised mass
Writeuphelp
Writeup from MB 100:

Northwest Africa 6950 (NWA 6950)

(Northwest Africa)

Purchased: 2011 Aug

Classification: Lunar meteorite (gabbro)

History: Reported to be found near the border between Mali and Algeria in June 2011, and purchased from the finder by Adam Aaronson in August 2011.

Physical characteristics: A single yellowish-green stone (1649 g, broken into 8 pieces) with partial fusion crust. Thin black shock veins are visible in the interior.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively coarse grained with a cumulate igneous texture. Aggregate dominated by olivine, low-Ca pyroxene, pigeonite, and subcalcic augite, with interstitial very calcic plagioclase. Accessory minerals are ilmenite, Ti-chromite, armalcolite, troilite, baddeleyite, taenite and merrillite with rare zirconolite and K-feldspar.

Geochemistry: Olivine (Fa31.9-32.7, Fe/Mn=85-97), low-Ca pyroxene (Fs27.1-28.1Wo4.8-4.5, Fe/Mn=47-55), pigeonite (Fs25.6±0.0Wo9.2-11.1, Fe/Mn=47-52), subcalcic augite (Fs13.9Wo36.9, Fe/Mn=41), plagioclase (An87.9-93.0Or1.1-0.9).

Classification: Achondrite (lunar, gabbro). This specimen is texturally and mineralogically identical to NWA 2977 and the olivine gabbro clasts in NWA 773, NWA 2700, NWA 2727 and NWA 3333, and evidently is paired with those stones.

Specimens: A total of 20.1 g of sample and one polished thin section are on deposit at UWS. The main mass is held by Aaronson.

Data from:
  MB100
  Table 1
  Line 1551:
Place of purchase:Temara
Date:P 2011 Aug
Mass (g):1649
Pieces:1
Class:Lunar (gabbro)
Shock stage:moderate
Weathering grade:very low
Fayalite (mol%):31.9-32.7
Ferrosilite (mol%):27.1-28.1; 25.6±0.0; 13.9
Wollastonite (mol%):4.8-4.5; 9.2-11.1; 36.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWS
Main mass:Aaronson
Comments:Submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Connor Puritz   
Denis gourgues      
Dominik Stoeckli   
John Tanner   
MCMcanarias   
Michael S. Scherman   
Michael Szczepanski   
Noel Darlucio Pura   
Richard Cardial   
xeqtr   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 5838 approved meteorites from (Northwest Africa) (plus 2066 unapproved names)

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