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Northwest Africa 4042
Basic information Name: Northwest Africa 4042
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4042
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 56.2 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 131 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 3 Feb 2006
Revised 9 Sep 2006: Update classification
Writeuphelp
Writeup from MB 90:

Northwest Africa 4042

Find: 2004

Achondrite (ungrouped)

History: A single stone weighing 56.2 g was found by an anonymous finder in the western part of the Sahara in Morocco.

Petrography, Composition, and Classification: (A. Greshake, MNB) The rock is composed of mostly equigranular olivine (~93.3), somewhat larger low-Ca pyroxene (~4.6), Fe,Ni metal (0.7), pyrrhotite (~0.4), and Mg-Al-Ti chromite (~1.1; all vol%).

Geochemistry: Olivine (Fa20.3; Cr2O3 and CaO between 0.03–0.07 wt%), pyroxene (Fs16.2Wo1.0). Total C = 834 ppm (I. Franchi and R. C. Greenwood, OU). Oxygen isotopes: (I. Franchi and R. C. Greenwood, OU) δ17O = 2.539, δ18O = 5.178, ∆17O = −0.154 (all ‰; n = 5) plot close to aubrites, brachinites, and winonaites; however, no unambiguous assignment to a particular meteorite class can be made.

Classification: Achondrite (ungrouped); low shock.

Specimens: One 11.6 g type specimen and one thin section are on deposit at MNB. Stefan Ralew of Kunibertstraße 29, 12524 Berlin, Germany, holds the main mass.

Data from:
  MB90
  Table 2
  Line 261:
Place of purchase:Morocco
Date:2004
Mass (g):56.2
Pieces:1
Class:Aung
Shock stage:S2
Weathering grade:W2
Type spec mass (g):11.6
Plots: O isotopes:  
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Don Edwards   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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