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Northwest Africa 6172
Basic information Name: Northwest Africa 6172
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6172
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 153 g
Meteoritical Bulletin:  MB 100  (2012)  Achondrite-ung 
Recommended:  Achondrite-ung    [explanation]

This is 1 of 151 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 6172 (NWA 6172)

(Northwest Africa)

Purchased: Dec 2009

Classification: Ungrouped achondrite

History: Purchased in 2009 December by Thomas Webb from a Moroccan dealer in Agadir.

Physical characteristics: A single dark brown stone weighing 153 g.

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

Geochemistry: Olivine Fa30.3-30.6, Fe/Mn=59-63; clinopyroxene Fs9.5-10.0Wo43.1-43.8, Fe/Mn=40-47; orthopyroxene Fs24.3-24.6Wo2.2-2.3, Fe/Mn=36-38. Oxygen isotopes (D. Rumble, CIW): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O = 2.78, 3.00; δ18O = 5.35, 5.54; Δ17O = -0.036, 0.091 per mil.

Classification: Achondrite (brachinite-like, ungrouped). Paired with NWA 5400, 5548, 6077, 6292, 6424, 5363, and 6572.

Specimens: A total of 1.8 g and one polished thin section are on deposit at UWS; a further 20 g and one thin section are on deposit at BathO. Mr. T. Webb holds the main mass.

Data from:
  Table 1
  Line 1297:
Place of purchase:Agadir
Date:P Dec 2009
Mass (g):153
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):30.3-30.6
Ferrosilite (mol%):9.5-10.0; 24.3-24.6
Wollastonite (mol%):43.1-43.8; 2.2-2.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.8
Type spec location:1.8g UWS; 20g BathO
Main mass:TWebb
Comments:Submitted by A. Irving
Plots: O isotopes:  
   and collections
BathO: Bathurst Observatory Research Facility, 624 Limekilns Road, Kelso NSW 2795, Australia (institutional address; updated 27 Jul 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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