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Northwest Africa 2904 | |||||||||||||
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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: ![]() | ||||||||||||
Classification history: |
This is 1 of 400 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||
Comments: | Approved 21 Sep 2005 | ||||||||||||
Writeup![]() |
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: |
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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) 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
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Geography: |
Statistics: This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names) |