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Northwest Africa 3133
Basic information Name: Northwest Africa 3133
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 3133
Observed fall: No
Year found: 2004
Country: Morocco
Mass:help 4.19 kg
Meteoritical Bulletin:  MB 89  (2005)  Achondrite-prim-ung
MetBase:  v. 7.1  (2006)  Achondrite-ung
Recommended:  CV7    [explanation]

This is 1 of 2 approved meteorites classified as CV7.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CV chondrites, and CV chondrites (equilibrated)
Comments: Revised 24 May 2019: Paired with NWA 2653
Writeup from MB 89:

Northwest Africa 3133


Purchased 2004 March/August

Primitive achondrite (ungrouped)

Several complete, dense, brown stones (total 2393 g) were purchased in Tagounite by a Moroccan dealer for A. and G. Hupé (xHupé) in 2004 March and August.  Classification and mineralogy (T. Bunch and J. Wittke, NAU; A. Irving and S. Kuehner, UWS): equigranular texture of subhedral to anhedral grains with ~120° triple junctions; mean grain size = 0.28 mm.  Moderate but pervasive weathering (W2) has converted some metal and troilite to brown iron hydroxides, which also coat grain boundaries.  Mineral mode in vol.%: olivine 46, orthopyroxene 28, plagioclase 7, Cr-diopside 5, Na-Mg-bearing merrillite 4, metal (including associated hydroxides) 5, chromite 3 and troilite 2.  Highly equilibrated mineral compositions: olivine (Fa22.2 to Fa22.6, FeO/MnO = 57 - 69), orthopyroxene (Fs18.6Wo2.8 to Fs19.2Wo2.1, FeO/MnO = 38 - 49), diopside (Fs7.3Wo44.6 to Fs8.7Wo42.2, FeO/MnO = 21 - 33, Cr2O3 = 0.56 to 0.82 wt.%, Al2O3 =1.21 to 1.74 wt.%), plagioclase (An50.1Or2.5 to An53.5Or2.3), metal (Ni = 17.4 - 20.2 wt.%), chromite (TiO2 = 2.61 wt.%, Cr/(Cr+Al) = 0.73), troilite (Ni = 1.2 - 5.2 wt.%).  Oxygen isotopes: replicate analyses of an acid-washed whole rock sample by laser fluorination (D. Rumble, CIW) gave respectively δ18O = 3.06, 2.46, δ17O = -1.75, -2.25, Δ17O = -3.36, -3.54 per mil, and triplicate analyses of an acid-washed olivine-rich separate by laser fluorination (T. Larson and F. Longstaffe, UWO) gave respectively δ18O = 1.78, 0.92, 0.89, δ17O = -2.91, -3.67, -3.62, Δ17O = -3.84, -4.16, -4.08 per mil.  All of these oxygen isotope compositions plot on the CV3 mixing line, suggesting that this achondritic meteorite has affinities with CV chondrites (Irving et al., 2004).  Specimens: type specimens, 20.1 g, and one polished thin section, NAU; 40.3 g, and four polished thin sections, UWS; main mass, xHupé.

Writeup from MB 108:
NWA 3133, reclassification

A. Irving, UWS: The bulk elemental composition of NWA 3133 (and by inference paired specimen NWA 2653) is very similar to that of Allende and other CV3 chondrites, and different from those of other carbonaceous chondrite classes. In particular the Al/Mg versus Mn/Mg systematics for NWA 3133 plot within the field of CV3 chondrites.
Data from:
  Table 7
  Line 471:
Origin or pseudonym:Morocco
Mass (g):4193
Class:Primitive achondrite
Type spec mass (g):20.1
Comments:pts at UWS; Undefined note. NAU is Northern Arizona University, Flagstaff, AZ 86011, USA
Plots: O isotopes:  
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
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)
xHupé: (old address—now see GHupé or AHupé) G. and A. Hupe, 2616 Lake Youngs Court SE, Renton, WA 98058., United States (private address)
References: Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 1903 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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