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Northwest Africa 2899
Basic information Name: Northwest Africa 2899
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2899
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 11 g
Meteoritical Bulletin:  MB 90  (2006)  OC
Recommended:  H-melt rock    [explanation]

This is 1 of 13 approved meteorites classified as H-melt rock.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Sep 2005
Revised 9 Sep 2006: Update classification
Writeup from MB online:

Northwest Africa 2899

Northwest Africa

Find: 2004

Ordinary chondrite (H-related impact-melt rock)

History: A single stone of 11 g was found 2004 by an anonymous finder in the North African Saharan desert. Petrography: (A. Greshake, MNB) The stone is composed of small, mostly euhedral olivines (Fa6.1–23.9) embedded into a glassy groundmass. Most olivines show a pronounced compositional zoning with Mg-rich cores and Fe-rich rims or vice versa. Small spherical Fe,Ni sulfides are often found in the groundmass and Fe,Ni metal is present. Chondrules were not observed.

Geochemistry: Oxygen isotopes: (I. Franchi and R. C. Greenwood, OU) δ17O = +3.088, δ18O = +4.898, ∆17O = +0.541 (all ‰).

Classification: Ordinary chondrite (H-related impact-melt rock) with shock-related crystallized impact melt, W0/1.

Specimens: A 2.5 g type specimen and one polished thin section are on deposit at MNB. Stefan Ralew of Germany holds the main mass.

Data from:
  Table 2
  Line 155:
Place of purchase:Unknown
Mass (g):11
Type spec mass (g):2.5
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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