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Northwest Africa 5961
Basic information Name: Northwest Africa 5961
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5961
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 259 g
Meteoritical Bulletin:  MB 100  (2012)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 280 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 1 Apr 2012
Writeup from MB 100:

Northwest Africa 5961 (NWA 5961)

(Northwest Africa), Morocco

Purchased: May 2009

Classification: HED achondrite (Eucrite, monomict)

History: A stone found near Zag, Morocco, in May 2009 was purchased by Ali and Mohammed Hmani.

Physical characteristics: A single, 259 g, orange-brown stone, partially covered with remnant dark-brown fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS): Ophitic-textured assemblage of calcic plagioclase laths and exsolved pigeonite blades accompanied by relatively large grains of silica polymorph, chromite (of variable Ti content), ilmenite and rare zircon. Exsolved pyroxenes have either coarse lamellae of clinopyroxene in an orthopyroxene host, or lamellae of orthopyroxene in a clinopyroxene host. Plagioclase contains abundant microscopic blebs of exsolved orthopyroxene.

Geochemistry: Orthopyroxene (Fs59.1-59.6Wo4.6-5.1, Fe/Mn=29.7-31.6), clinopyroxene (Fs29.1-29.3Wo40.3-40.7, Fe/Mn=31.3-32.7), plagioclase (An88.2-89.7Or0.7). Oxygen Isotopes (D. Rumble, CIW): acid-washed material analyzed by laser fluorination gave, respectively δ18O = 3.63, 3.58; δ17O = 1.66, 1.63; Δ17O = -0.251, -0.253 per mil.

Classification: Achondrite (eucrite, monomict).

Specimens: 22 g, two polished thin sections, and a polished mount are on deposit at UWS. The remaining material is held by an anonymous collector.

Data from:
  Table 1
  Line 1283:
State/Prov/County:(Northwest Africa)
Place of purchase:Erfoud
Date:P May 2009
Mass (g):259
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):59.1-59.6; 29.1-29.3
Wollastonite (mol%):4.6-5.1; 40.3-40.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22
Type spec location:UWS
Main mass:Anonymous
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)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Hmani: A. Hmani Moroccan Imports, 13 rue Jules Hardouin Mansart, 92600 Asnières, France (private address)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev   

     This is 1 of 9689 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
Synonymshelp: Northwest Africa 5691 (NWA 5691 is the same meteorite as NWA 5961)
NWA 5691 (NWA 5691 is the same meteorite as NWA 5961)

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