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Northwest Africa 6888
Basic information Name: Northwest Africa 6888
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6888
Observed fall: No
Year found: 2011
Country: Western Sahara
Mass:help 208 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 84 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 26 Sep 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6888 (NWA 6888)        24°38.57’N, 14°41.27’W

Ri­­o­­ de Oro, Western Sahara

Found: 2011 May 28

Classification: Lunar meteorite

History: The meteorite was found by anonymous finder on the Sueilila (Zwilila) limestone plateau, ~40 km E of Hassi Lakra (Playa del Cordero) station, in the desert.

Physical characteristics: One brownish-grey to dark green stone weighing 208 g in total, with no fusion crust.

Petrography: (Lorenz C.A., Ivanova M.A., and Demidova S.I. Vernad.) The meteorite is polymict, melt matrix breccia, consisting of numerous mineral and lithic fragments embedded in a fine-grained devitrified matrix. Lithic clasts dominated by melt breccias, granulites, anorthosites, gabbro, gabbro-norites, troctolites and VLT-like basalts. Rare spherules of devitrified glass occur. The size range of the clasts is 0.02-9 mm; the main minerals are pyroxene and feldspar; minor - olivine, silica, chromite, ilmenite, Zr-armolcolite, troilite, and FeNi metal.

Geochemistry: (Kononkova N.N., Vernad, EMP) feldspar An91-97Ab2.8-6.0; clinopyroxene En7.7-68.3Wo5.1-42.0, orthopyroxene En44.4-75.0Wo2.6-4.9 (FeO/MnO = 60.03), olivine Fo4.7-63.3 (FeO/MnO = 87); ilmenite (MgO 0.24-4.02 wt%), Al,Ti-chromite (TiO2 8.4 wt%, Al2O3 8.2 wt%) and ulvospinel. FeNi metal: 0.68-9.51 wt% Ni; 0.40-2.27 wt% Co; sulfide is troilite.

Classification: Lunar (regolith breccia). The grade of weathering is moderate.

Specimens: A total of 21.7 g of sample and two thin sections are on deposit at Vernad. An anonymous finder holds the main mass of the meteorite.

Data from:
  MB100
  Table 1
  Line 1526:
State/Prov/County:Rio de Oro
Date:2011 May 28
Latitude:24°38.57'N
Longitude:14°41.27'W
Mass (g):208
Pieces:1
Class:Lunar
Classifier:Lorenz C.A., Ivanova M.A., Demidova S.I., Vernad
Type spec mass (g):21.7
Type spec location:Vernad
Main mass:anonymous
Comments:Submitted by C. A. Lorenz
Institutions
   and collections
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Timur Kriachko      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Christophe PICQ   
Jaeyong Lee   
xeqtr   
Geography:

Western Sahara
Coordinates:
     Recommended::   (24° 38' 34"N, 14° 41' 16"W)

Statistics:
     This is 1 of 36 approved meteorites from Rio de Oro, Western Sahara
     This is 1 of 204 approved meteorites from Western Sahara (plus 20 unapproved names)
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