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Northwest Africa 6572
Basic information Name: Northwest Africa 6572
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6572
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 50.2 g
Meteoritical Bulletin:  MB 100  (2012)  Achondrite-ung 
Recommended:  Achondrite-ung    [explanation]

This is 1 of 154 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 18 Feb 2012
Writeup from MB 100:

Northwest Africa 6572 (NWA 6572)

(Northwest Africa)

Purchased: Oct 2010

Classification: Ungrouped achondrite

History: Purchased in 2010 October by Thomas Webb from a Moroccan dealer in Erfoud.

Physical characteristics: A group of 17 similar-looking dark-brown stones weighing in total 50.2 g.

Petrography: Protogranular texture. Composed predominantly of olivine with accessory clinopyroxene, orthopyroxene, chromite, altered kamacite and troilite. Plagioclase is absent and no phosphate minerals were found.

Geochemistry: Olivine Fa30.4-30.5, Fe/Mn=57-68; clinopyroxene Fs9.5-9.7Wo44.2-44.0, Fe/Mn=24-26, Cr2O3=0.75 wt%; orthopyroxene Fs24.5-24.9Wo2.1-2.2, Fe/Mn=35-37. Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O=2.881, 2.956; δ18O=5.619, 5.701; Δ17O=-0.076, 0.044 per mil.

Classification: Achondrite (brachinite-like, ungrouped). Paired with NWA 5400, 5548, 6077, 6172, 6292, 6424, and 5363.

Specimens: A total of 10.1 g from two separate stones and one polished thin section are on deposit at UWS. Mr. T. Webb holds the main masses.

Data from:
  Table 1
  Line 1422:
Place of purchase:Erfoud
Date:P Oct 2010
Mass (g):50.2
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):30.4-30.5
Ferrosilite (mol%):9.5-9.7; 24.5-24.9
Wollastonite (mol%):44.2-44.0; 2.1-2.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):10.1
Type spec location:UWS
Main mass:TWebb
Comments:Submitted by A. Irving
Plots: O isotopes:  
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
TWebb: No contact information provided., United States (private address)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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