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Northwest Africa 6486 | |||||||||||||||||||||
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Basic information | Name: Northwest Africa 6486 This is an OFFICIAL meteorite name. Abbreviation: NWA 6486 Observed fall: No Year found: 2009 Country: Morocco Mass: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 47 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![]() |
Writeup from MB 100:
Northwest Africa 6486 (NWA 6486) Morocco 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: MB100 Table 1 Line 1393: |
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Plots: | O isotopes: | ||||||||||||||||||||
Institutions 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography:![]() |
Statistics: This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater) |