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Northwest Africa 8575
Basic information Name: Northwest Africa 8575
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8575
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 394 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  L/LL3
Recommended:  L/LL3    [explanation]

This is 1 of 30 approved meteorites classified as L/LL3.   [show all]
Search for other: L chondrites, L/LL chondrites, L/LL chondrites (type 3), LL chondrites, Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 25 Oct 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8575 (NWA 8575)

Morocco

Purchased: May 2014

Classification: Ordinary chondrite (L/LL3)

Geochemistry: Ferroan olivine contains 0.04±0.03 wt.% Cr2O3; Kamacite: 1.1±0.1 wt.% Co (n=10) Other elements (P, Cr, Si) are below the detection limit.; The olivine Cr2O3 content suggests a subtype of 3.2 or higher according to the diagram from Grossman and Brearley (2005).

Classification: A few porphyritic chondrules contain small amounts of isotropic colorless glass, suggesting a subtype of 3.5 or lower. So the subtype should be between 3.2 and 3.5. The low mean olivine content is in the H range, but this does not matter because the standard deviation is so high. There is also no peak at the mean value, only a continuum of olivine Fa values. According to Rubin (1990), the kamacite Co contents of L chondrites are 0.70-0.95 wt.%; those of LL chondrites are 1.42-37.0 wt.%. The value in this meteorite is in between these ranges, suggesting it is L/LL. The meteorite contains fairly large chondrules, mostly between 400 and 600 μm in diameter, consistent with either an L or 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)
  • Rubin A.E. (1990) Kamacite and olivine in ordinary chondrites - Intergroup and intragroup relationships. Geochhim. Cosmochim. Acta 54 1217-1232 (link)
Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P May 2014
Mass (g):394.18
Pieces:1
Class:L/LL3
Shock stage:S1
Weathering grade:W3
Fayalite (mol%):17.6±6.2 (n=16)
Ferrosilite (mol%):5.8±6.1 (n=10)
Wollastonite (mol%):0.4±0.3
Classifier:A. Rubin, UCLA
Type spec mass (g):35.87
Type spec location:UCLA
Main mass:Sean Tutorow
Comments:Field number - G570. Purchased by Brahim Tahiri from a Moroccan hunter in Erfoud, Morocco and sent to his partner Sean Tutorow for classification.; 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:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1374 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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