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Northwest Africa 4741
Basic information Name: Northwest Africa 4741
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4741
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 20 g
Meteoritical Bulletin:  MB 99  (2011)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 155 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 26 Oct 2010
Writeup from MB 99:

Northwest Africa 4741 (NWA 4741)

(Northwest Africa)

Found: unknown

Classification: Ungrouped achondrite

History: One single stone purchased in Erfoud, June 2005.

Physical characteristics: The stone measures 40×20×15 mm and weighs 20 g. It is 70% covered with dark brown fusion crust and discrete regmaglypts. The interior is light gray and fine grained.

Petrography: (A. Jambon, O. Boudouma, D. Badia, UPVI; J-A Barrat and M. Bohn, UBO). Dominant olivine and low-Ca pyroxene exhibit thin, iron-enriched rims at the contact with interstitial glass. Troilite, chromite, kamacite, taenite, and augite are also present. The sample is partly brecciated and shock melted. Some crystals of olivine and pyroxene have serrated overgrowths a few micrometers wide. Mode (vol %): olivine = 24%; pyroxene = 64%; glass = 6 %; voids 4%; accessories 2%.

Geochemistry: Olivine: Fo97, FeO/MnO = 20. Enstatite: En94Fs5Wo1, FeO/MnO = 19. Major elements by ICP-AES and  trace element composition by ICP-MS (J.-A. Barrat UBO): silicic-feldspathic glass: SiO2 = 76-68 wt%; Al2O3 = 6-13 wt%; FeO = 4-7 wt%; CaO = 2-10 wt%; Na2O = 1-4 wt%; K2O = 0.7-0.2 wt%. Bulk composition: SiO2 =52.7 wt%; MgO = 37.3 wt%; FeO = 6.06 wt%; NiO = 0.1 wt%. Incompatible elements abundances close to chondritic. Light REE depleted pattern with La/Lu = 0.57 × chondritic. Negative Eu anomaly, Eu*/Eu = 0.60. Anomalous ratio of Na/K = 3.0 (by wt). Oxygen Isotopes (R. Greenwood and I. Franchi, OU): δ18O = 4.99 ‰, δ17O = 2.64 ‰, Δ17O = 0.047 ‰.

Classification: Achondrite (ungrouped). Only marginally weathered. Shock melted.

Specimens: A total sample mass of 5 g and one polished section are on deposit at UPVI. An anonymous collector holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Mass (g):20
Fayalite (mol%):3
Ferrosilite (mol%):5
Wollastonite (mol%):1
Classifier:A. Jambon
Type spec mass (g):5
Type spec location:UPVI
Main mass:anon
Comments:Submitted by A. Jambon
Plots: O isotopes:  
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UPVI: Université Pierre et Marie Curie (Paris VI),Case 110, 4 Place Jussieu, 75005 Paris, France (institutional address; updated 5 Oct 2014)
UBO: Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, place Nicolas Copernic, F-29280 Plouzané Cedex, France (institutional address; updated 15 Sep 2017)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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