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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 25 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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