Meteoritical Bulletin: Entry for Northwest Africa 6486

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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: 4.5 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	L-melt rock
Recommended:			L-melt rock [explanation]

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

help

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 En_55.9-61.8Wo_9.6(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:

Place of purchase:	Ouarzazate, Morocco
Date:	P April 2009
Mass (g):	4.5
Pieces:	1
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:

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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

Find references in NASA ADS:
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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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