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Northwest Africa 6486
Basic information Name: Northwest Africa 6486
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6486
Observed fall: No
Year found: 2009
Country: Morocco
Mass:help 4.5 g
Meteoritical Bulletin:  MB 100  (2012)  L-melt rock 
Recommended:  L-melt rock    [explanation]

This is 1 of 52 approved meteorites classified as L-melt rock.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 26 Sep 2011
Writeup from MB 100:

Northwest Africa 6486 (NWA 6486)


Purchased: April 2009

Classification: Ordinary chondrite (L, melt rock)

History: Stone purchased by anonymous collector in Ouarzazate, Morocco, in April 2010

Physical characteristics: An elliptically-shaped, 4.5 g grayish-brown stone, without fusion crust.

Petrography: (C. A. Lorenz; Vernad) The meteorite has a medium-grained porphyritic texture. Subhedral olivine crystals (56 vol%) embedded in a matrix of glass with fine microlites of pyroxene. Inclusions (2.6 vol%) of eutectic-like aggregates of troilite and Fe-Ni metal are scattered throughout the rock. Metal is fine intergrowth of kamacite and taenite.

Geochemistry: (N. N. Kononkova, Vernad, EMP) olivine Fo 77.3 (Fe/Mn = 47.2); pyroxene En55.9-61.8Wo9.6 (Fe/Mn = 23-28); kamacite (7 wt% Ni, Ni/Co = 7); bulk matrix (in wt%): SiO2 60.8, TiO2 0.37, Al2O3 7.77, Na2O 2.64, K2O 2.04, CaO 7.44, MgO 10.4, MnO 0.27, FeO 6.04, Cr2O3 0.47; oxygen isotopes (I. Franchi, R. Greenwood, OU, Laser fluorination): δ17O = 3.489, δ18O = 4.591, Δ17O = 1.103 (per mil).

Classification: L-melt rock

Specimens: A total of 3.5 g main mass sample and one thin polished section are on deposit at Vernad.

Data from:
  Table 1
  Line 1393:
Place of purchase:Ouarzazate, Morocco
Date:P April 2009
Mass (g):4.5
Class:L-melt rock
Classifier:C. A. Lorenz, Vernad
Type spec mass (g):3.5
Type spec location:Vernad
Main mass:Vernad
Comments:Submitted by C. A. Lorenz
Plots: O isotopes:  
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     This is 1 of 2093 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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