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Northwest Africa 4450
Basic information Name: Northwest Africa 4450
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4450
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 10 kg
Recommended:  EL-melt rock    [explanation]

This is 1 of 23 approved meteorites classified as EL-melt rock.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), Enstatite-rich meteorites, and Melted chondrites
Comments: Approved 18 Jun 2021
Writeup from MB 110:

Northwest Africa 4450 (NWA 4450)

(Northwest Africa)

Purchased: 2006 Feb

Classification: Enstatite chondrite (EL melt rock)

History: Purchased by Nelson Oakes in February 2006 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) The specimen is composed predominantly of enstatite with subordinate sodic plagioclase, and is crosscut by numerous thin goethite veinlets (red-brown in thin section). Sparse RP chondrules are present but the overall texture is microgranular and apparently highly recrystallized. Accessory phases are troilite, daubreelite, schreibersite and Si-bearing metal, plus secondary goethite (after primary metal) and minor gypsum.

Geochemistry: Enstatite (Fs0.2±0.1Wo1.4±0.0, range Fs0.1-0.5Wo1.4, N = 7), plagioclase (Ab82.0±0.7An13.8±0.5Or4.3±0.2, range Ab81.5-82.5An14.1-13.4Or4.4-4.1, N = 2), kamacite (Ni 2.8-6.2 wt.%, Si 0.7-1.2 wt.%, N = 5).

Classification: Enstatite chondrite (EL melt rock). Paired with Al Haggounia 001 and other material from the same site.

Specimens: 22.5 g including one polished thin section is at PSF; remainder with Mr. N. Oakes.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2006 Feb
Mass (g):10000
Class:EL-melt rock
Shock stage:S6
Weathering grade:W4
Ferrosilite (mol%):0.2±0.1
Wollastonite (mol%):1.4±0.0
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):22.5
Type spec location:PSF
Main mass:N. Oakes
Comments:Submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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