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Northwest Africa 817
Basic information Name: Northwest Africa 817
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 817
Observed fall: No
Year found: 2000
Country: Morocco
Mass:help 104 g
NHM Catalogue:  5th Edition  (2000)  Martian (nakhlite)
Meteoritical Bulletin:  MB 85  (2001)  Martian (nakhlite)
MetBase:  v. 7.1  (2006)  Nakhlite
Recommended:  Martian (nakhlite)    [explanation]

This is 1 of 23 approved meteorites classified as Martian (nakhlite).   [show all]
Search for other: Martian meteorites
Writeup from MB 85:

Northwest Africa 817

Found 2000 December
Martian meteorite (nakhlite)

A 104 g stone was found in the desert of Morocco. Classification and analysis (V.  Sautter, MNHNP; J. Barrat and M. Lesourd, UAng; A. Jambon, UPVI; P. Gillet, ENSL; C. Göpel and J. Joron, IPGP): an unbrecciated, medium-grained, olivine-bearing clinopyroxenite with cumulate texture; consists of zoned, euhedral, subcalcic augite (Wo38–40 En38–27Fs24–34 and Fe/Mn = 39–31), olivine (zoned from Fa57 in cores to Fa86 in rims, with Fe/Mn = 54–43) with crystallized magmatic inclusions, and a three-component intercumulus mesostasis (glass including minute amounts of sulfide droplets, Ti-magnetite with unusual skeletal morphology containing ilmenite exsolution, and acicular pyroxene); mineral modes (vol%), pyroxene = 69, olivine = 15, mesostasis = 15, and Fe-Ti oxides = 1; alteration (probably pre­terrestrial) produced a hydrous ferrous silicate both in olivine and in the glassy mesostasis; bulk major-element composition similar to other nakhlites; element ratios confirm martian origin (FeO*/MnO = 37 mol/mol, Na/Al = 0.40, K/La = 449, Ga/Al = 3.9 × 10–4); has a higher proportion of mesostasis than other nakhlites; displays the highest Th, U and rare earth elements (REE) concentrations ever reported for a nakhlite (e.g., Th = 0.6 ppm); REE pattern characterized by a strong light REE enrichment (Lan/Ybn = 4.89), and Eu/Eu* =

0.90. Oxygen isotopes (M. Javoy and E. Petit, IPGP): 17O = +0.4·. Specimens: 10 g, ENSL; main mass, Fectay.

Data from:
  Table 4
  Line 217:
Date:Dec 2000
Mass (g):104
   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)
Fectay: Bruno Fectay and Carine Bidaut, La Memoire de la Terre SARL, 39800 Aumont, France; Website (private address)
IPGP: Institute de Physique du Globe de Paris, 1 rue Jussieu, 75252 Paris, Cedex 05, France (institutional address; updated 3 Nov 2014)
UAng: Université d'Angers, Faculté des Sciences, 2 bd Lavoisier, 49045 Angers Cedex, France (institutional address)
References: Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)
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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)
MeteoriteCollector.org - FCOM - Russ Finney   
Volker Heinrich   


     This is 1 of 1550 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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