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Northwest Africa 8576
Basic information Name: Northwest Africa 8576
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8576
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 59.5 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  LL3.00
Recommended:  LL3.00    [explanation]

This is 1 of 4 approved meteorites classified as LL3.00.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 25 Oct 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8576 (NWA 8576)

Morocco

Purchased: May 2014

Classification: Ordinary chondrite (LL3.00)

History: Purchased by Brahim Tahiri from a Moroccan hunter in Erfoud, Morocco and sent to his partner Sean Tutorow for classification.

Geochemistry: Ferroan olivine contains 0.46±0.09 wt.% Cr2O3, n=25; Kamacite: 0.42±0.26 wt.% Co; 5.5±1.8 wt.% Ni (n=9). There is a positive correlation between the Co and Ni values in the kamacite, as is found in other highly unequilibrated chondrites. The Cr content of the kamacite is 0.22±0.31 wt.% with a range of 0.00-0.84 wt.%. P (0.03±0.03 wt.%) and Si (0.03±0.04 wt.%) are both approximately at the detection limit.

Classification: Optical microscopy shows that this meteorite has ferroan olivine grains with no chromite exsolution; this implies it is outside the 3.05-3.15 range. About 10 different porphyritic chondrules in the thin section were examined. The meteorite cannot be type 3.2 or higher since it has such high Cr in the ferroan olivine and a low standard deviation similar to Semarkona (LL3.00), Grossman and Brearley (2005). The chondrules average about 600 μm in diameter, consistent with an LL classification.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P May 2014
Mass (g):59.45
Pieces:1
Class:LL3.00
Shock stage:S1
Weathering grade:W4
Fayalite (mol%):14.3±5.9 (n=25)
Ferrosilite (mol%):10.0±8.4 (n=20)
Wollastonite (mol%):1.0±1.1
Classifier:A. Rubin, UCLA
Type spec mass (g):11.90
Type spec location:UCLA
Main mass:Sean Tutorow
Comments:Field number - G580.; submitted by Sean Tutorow
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1498 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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