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Northwest Africa 1240
Basic information Name: Northwest Africa 1240
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1240
Observed fall: No
Year found: 2001
Country: (Northwest Africa)
Mass:help 98 g
NHM Catalogue:  5th Edition  (2000)  Eucrite
Meteoritical Bulletin:  MB 86  (2002)  Eucrite-an
MetBase:  v. 7.1  (2006)  Eucrite-cm
Recommended:  Eucrite-cm    [explanation]

This is 1 of 48 approved meteorites classified as Eucrite-cm.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeup from MB 86:

Northwest Africa 1240

Northwest Africa

Found 2001

Achondrite (eucrite, anomalous)

A single stone of 98 g was bought in Zagora in 2001 November. Classification and mineralogy (J-A. Barrat, UAng; A. Jambon, UPVI; M. Bohn, I-CB; V. Sautter, MNHNP; Ph. Gillet, ENSL; Ch. Göpel, IPGP; F. Keller, LGCA): the meteorite has the texture of an unbrecciated achondrite consisting of skeletal low-Ca pyroxene phenocrysts in a variolitic (fan-spherulitic) mesostasis of pyroxenes, plagioclase, and accessory skeletal chromite, iron, silica, fayalite, troilite and phosphate. The rock resembles some Apollo 15 pigeonite basalts but mineral and bulk rock compositions indicate a relationship to eucrites. Pyroxenes (FeO/MnO molar = 31, n = 540) are unequilibrated and comprise a compositional range wider than in any other HED meteorite with phenocryst cores, En76Fs22.1Wo1.9, and mesostasis pyroxenes (pyroxferroite?), En0.3Fs83.4Wo16.3; plagioclase, An90.9 (n = 122), range, An88 to An92. Bulk composition: Mg-rich Kapoeta-like clasts; slightly depleted in light REEs similar to the cumulate eucrite Moore County; possibly an impact-melted cumulate eucrite. Specimens: type specimen, 17 g and one polished thin section, ENSL; main mass is with the anonymous purchaser.

Data from:
  Table 6
  Line 155:
Date:P Nov 2001
Mass (g):98
   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)
UPVI: Université Pierre et Marie Curie (Paris VI),Case 110, 4 Place Jussieu, 75005 Paris, France (institutional address; updated 5 Oct 2014)
I-CB: Institut Français de recherché pour l’exploitation de la mer Brest, BP70, F-29280 Plouzané Cedex, France (institutional address)
IPGP: Institute de Physique du Globe de Paris, 1 rue Jussieu, 75252 Paris, Cedex 05, France (institutional address; updated 3 Nov 2014)
LGCA: Laboratoire de Géodynamique des Chaînes Alpines, CNRS UMR 5025, Université Joseph Fourier, Maison des Géosciences, 1381 rue de la piscine, 38400 St. Martin d'Hères, France (institutional address)
UAng: Université d'Angers, Faculté des Sciences, 2 bd Lavoisier, 49045 Angers Cedex, France (institutional address)
References: Published in Meteoritical Bulletin, no. 86, MAPS 37, A157-A184 (2002)
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     This is 1 of 7547 approved meteorites from (Northwest Africa) (plus 1970 unapproved names)

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