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Northwest Africa 4416
Basic information Name: Northwest Africa 4416
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4416
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 259 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  EL6
Recommended:  EL6    [explanation]

This is 1 of 120 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
Writeuphelp
Writeup from MB 94:

Northwest Africa 4416

Northwest Africa

Find: 2006

Enstatite chondrite (EL6)

History: A single stone was purchased at the Erfoud market by an anonymous collector.

Physical characteristics: A single dark brown stone of 259.1 g with no fusion crust and traces of 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. Thin veinlets about 200 μm wide in a subparallel and anastomozing array and filled with iron oxides/hydroxides can be easily observed in reflected light. Enstatite accounts for about 90% of the total volume. Relic chondrules are mainly RP type, with minor PP, and range from 0.3 to 0.8 mm in diameter. Minor phases are altered kamacite, altered troilite and plagioclase. Accessory phases are schreibersite and daubreelite, frequently associated with troilite.

Geochemistry: Enstatite (En98.9Wo1.1), plagioclase (An15.3Or4.7). Oxygen isotopes (R. Greenwood, I. Franchi, OU) δ17O = 3.342‰; δ18O = 6.385‰; Δ17O = -0.009‰.

Classification: Enstatite chondrite (EL6); S1; W3. This specimen is probably paired with NWA 4415.

Specimens: A total of 22 g, one polished thin section and a block are on deposit at MSP. An anonymous collector holds the main mass.  

 

Data from:
  MB94
  Table 2
  Line 18:
State/Prov/County:Northwest Africa
Date:2006
Mass (g):259.1
Pieces:1
Class:EL6
Ferrosilite (mol%):1.1
Wollastonite (mol%):1.1
Classifier:V. Moggi Cecchi, G. Pratesi, Museo di Scienze Planetarie
Type spec mass (g):22
Type spec location:MSP
Main mass:anonymous
Comments:Probably paired with NWA 4415
Plots: O isotopes:  
Institutions
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 5 Mar 2014)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Don Edwards   
Matteo Chinellato   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7374 approved meteorites from (Northwest Africa) (plus 1957 unapproved names)

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