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Northwest Africa 1617
Basic information Name: Northwest Africa 1617
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1617
Observed fall: No
Year found: 1998
Country: (Northwest Africa)
Mass:help 21 g
Meteoritical Bulletin:  MB 88  (2004)  Winonaite
MB 90  (2006)  Acapulcoite
MetBase:  v. 7.1  (2006)  Winonaite
Recommended:  Acapulcoite    [explanation]

This is 1 of 93 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Revised 3 Feb 2006: Reclassified
Writeup from MB 88:

Northwest Africa 1617


Purchased 2002 June

Achondrite (winonaite)

A small complete stone (23 g) was purchased in Agadir by a Moroccan dealer for N. Oakes (Oakes) in 2002 June.  Classification and mineralogy (A. Irving and S. Kuehner, UWS): Medium-grained, equilibrated texture with triple junctions among mineral grains.  Mostly magnesian low-Ca pyroxene (Wo2.2Fs11.2, FeO/MnO = 13) and forsteritic olivine (Fa11.6, FeO/MnO = 24) with Fe-Ni metal (5-10 wt% Ni), chromite (61-62 wt.% Cr2O3; Cr/(Cr+Al)= 0.878-0.904; Mg/(Mg+Fe)= 0.341-0.319; associated with troilite and interstitial sodic feldspar (Ab81Or3).  Limonite and minor calcite along grain boundaries presumably are products of terrestrial weathering.  Oxygen isotopes (D. Rumble, CIW): replicate analyses of acid-washed fragments by laser fluorination gave δ18O = 5.06‰, δ17O = 1.85‰, Δ17O = -0.86 ± 0.02‰.  This sample is a FeO-rich member of the winonaite group.  Specimens: type specimen, 4.5 g, and one polished thin section, UWS; main mass, Oakes.

Data from:
  Table 4
  Line 13:
Place of purchase:Agadir
Date:P 1 Jun 2002
Mass (g):23.44
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):4.5
Main mass:Oakes
Data from:
  Table 2
  Line 6:
Place of purchase:Agadir, Morocco
Date:Jun 1998
Mass (g):21
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):4.5
Type spec location:UWS
Comments:See separate entry in MB 88; Reclassification from an winonaite (MB 88) to an acapulcoite.
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)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)
Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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