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Northwest Africa 2904
Basic information Name: Northwest Africa 2904
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2904
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass:help 29 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Eucrite
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 339 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 Sep 2005
Writeuphelp
Writeup from MB online:

Northwest Africa 2904

Northwest Africa

Find: Spring 2003

Achondrite (eucrite, polymict)

History: Four stones totaling 29.04 g were recovered in the spring of 2003 from the western part of the Sahara in Morocco.

Classification and Mineralogy: (A. Greshake and M. Kurz, MNB) A polymict breccia consisting of lithic and mineral clasts set into a more fine-grained, brecciated groundmass of dominantly plagioclase and often exsolved Ca pyroxene; plagioclase frequently contains pyroxene and ilmenite inclusions. Plagioclase, An84.6–90.7; low-Ca pyroxene, Fs44.5–55.8Wo1.8–2.1; Ca pyroxene, Fs22.3–43.4Wo15.6–42.6; minor phases include Ti-rich chromite, silica, and ilmenite. Oxygen isotopes: (I. Franchi and R. C. Greenwood, OU) δ17O = +2.16, δ18O = +4.58, ∆17O = −0.222 (all ‰) and (R. Clayton and T. Mayeda, UChi): δ17O = +2.13, δ18O = +4.74, ∆17O = −0.33 (all ‰).

Classification: Achondrite (eucrite, polymict); moderate to high shock, extensive weathering.

Specimens: A 9.95 g type specimen and one polished thin section are on deposit at MNB. Main mass with an anonymous finder.

Data from:
  MB90
  Table 2
  Line 159:
Place of purchase:Unknown
Date:2003
Mass (g):29.04
Pieces:4
Class:Euc
Type spec mass (g):9.95
Plots: O isotopes:  
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
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)
UChi: University of Chicago, Chicago, IL 60637, United States (institutional address; updated 28 Feb 2011)
Kurz: M. Kurz, Schillerstrasse 7, D-34626 Neukirchen, Germany (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2027 unapproved names)

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