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Northwest Africa 725
Basic information Name: Northwest Africa 725
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 725
Observed fall: No
Year found: unknown
Country: Morocco
Mass:help 3.82 kg
Classification
  history:
NHM Catalogue:  5th Edition  (2000)  Acapulcoite
Meteoritical Bulletin:  MB 85  (2001)  Acapulcoite
MetBase:  v. 7.1  (2006)  Acapulcoite
Recommended:  Winonaite    [explanation]

This is 1 of 74 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Revised 26 Mar 2022: reclassified
Writeuphelp
Writeup from MB 111:
NWA 725: reclassification

(E. Jacquet, MNHNP) NWA 725 was originally classified as an acapulcoite on the basis of its reduced mineral chemistry (Fa6.1, Fs7.5). However, O isotope measurements of Greenwood et al. (2012) (see e.g. their Fig. 9) plot in the field of winonaites. The mineral chemistry, by itself, was ambiguous (i.e. lying in the overlap between acapulcoites and winonaites) as recognized by Keil and McCoy (2018) (see their Fig. 4), who excluded NWA 725 from their review of acapulcoites and lodranites. Becayse there seems to be a consensus on the matter (e.g. Zeng et al. 2019), NWA 725 should be reclassified as a winonaite (and an interestingly chondritic one at that).


Bibliography:
  • Greenwood R.C., Franchi I.A., Gibson J.M. and Benedix G.K. (2012) Oxygen isotope variation in primitive achondrites: The influence of primordial, asteroidal and terrestrial processes. Geochim. Cosmochim. Acta 94, 146-163. (link)
  • Keil K. and McCoy T. J. (2018) Acapulcoite-lodranite meteorites: Ultramafic asteroidal partial melt residues. Geochemistry 78, 153–203. (link)
  • Zeng X., Shang Y., Li S., Li X., Wang S. and Li Y. (2019) The layered structure model for winonaite parent asteroid implicated by textural and mineralogical diversity. Earth, Planets and Space 71. (link)
Data from:
  MB85
  Table 4
  Line 188:
Origin or pseudonym:Tissemoumine
Latitude:30°36'N
Longitude:5°03'W
Mass (g):3824
Pieces:11
Class:Acapulcoite
Fayalite (mol%):6.1
Ferrosilite (mol%):7.5
Classifier:Ph. Gillet (ENSL) and J.-A. Barrat (UAng)
Type spec mass (g):55
Main mass:anonymous buyer
Comments:CPX: Wo46Fs3.1En50.9
Institutions
   and collections
ENSL: Ecole Normale Supérieure de Lyon, Laboratoire de Sciences de la Terre, 46 allée d'Italie 69364 Lyon Cedex, France (institutional address; updated 27 Feb 2011)
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
UAng: Université d'Angers, Faculté des Sciences, 2 bd Lavoisier, 49045 Angers Cedex, France (institutional address)
Catalogs:
Search for this meteorite in the Natural History Museum collection (U.K.):   
    Require NHM photo
References: Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)
Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Bruno Fectay and Carine Bidaut   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Christophe PICQ   
Don Cuarzo   
Franco Vignato   
John Creech, Victoria University of Wellington   
Paul Griffin   
Phil Schmitz   
Volker Heinrich   
Woreczko Jan & Wadi   
Geography:

Morocco
Coordinates:
     Catalogue of Meteorites:   (30° 36'N, 5° 3'W)
     Recommended::   (30° 36'N, 5° 3'W)

Statistics:
     This is 1 of 62 approved meteorites from Meknès-Tafilalet, Morocco
     This is 1 of 1871 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)
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Synonymshelp: Tissemoumine (added by JNG)

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