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Northwest Africa 4415
Basic information Name: Northwest Africa 4415
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4415
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 10 g
Meteoritical Bulletin:  MB 94  (2008)  EL6
Recommended:  EL6    [explanation]

This is 1 of 136 approved meteorites classified as EL6.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Comments: Approved 8 Sep 2008
Writeup from MB 94:

Northwest Africa 4415

Northwest Africa

Find: 2006

Enstatite chondrite (EL6)

History: A small fragment was purchased at the Erfoud market by an anonymous collector.

Physical characteristics: A single dark brown piece of 10 g with no fusion crust and traces of marked staining.

Petrography: (V. Moggi Cecchi, G. Pratesi, MSP) The overall texture is characterized by rare relic chondrules and chondrule fragments set in a fine-grained matrix mainly composed of pyroxene. Several multiple subparallel and anastomozing thin veinlets, about 200 μm large, filled with iron oxides/hydroxides can be easily observed in reflected light in the thin section. Enstatite accounts for about 90% of the total volume. Relic chondrules are mainly RP type, with minor PP, and range from 0.2 to 0.8 mm in diameter. Minor phases are altered kamacite, altered troilite, and plagioclase. Accessory phases are schreibersite and daubreelite as blades.

Geochemistry: Enstatite (En98.5Wo1.5), plagioclase (An15.8Or4.4). Oxygen isotopes (R. Greenwood, I. Franchi, OU), δ17O = 3.340‰; δ18O = 6.388‰; Δ17O = -0.007‰.

Classification: Enstatite chondrite (EL6); S1; W3. This specimen is probably paired with NWA 4416.

Specimens: A total of 2 g, one polished thin section and a block are on deposit at MSP. An anonymous collector holds the main mass.

Data from:
  Table 2
  Line 17:
State/Prov/County:Northwest Africa
Mass (g):10
Ferrosilite (mol%):1.5
Wollastonite (mol%):1.5
Classifier:V. Moggi Cecchi, G. Pratesi, Museo di Scienze Planetarie
Type spec mass (g):2
Type spec location:MSP
Main mass:anonymous
Comments:δ18O = 3.340‰; δ17O = 6.388‰; Δ17O = -0.007‰.
Plots: O isotopes:  
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022)
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)
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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