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Northwest Africa 4454
Basic information Name: Northwest Africa 4454
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4454
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 322 g
Classification
  history:
Recommended:  H6    [explanation]

This is 1 of 6213 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 2 Aug 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 4454 (NWA 4454)

(Northwest Africa)

Purchased: 2006 Feb

Classification: Ordinary chondrite (H6)

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 almost entirely recrystallized with rare chondrule remnants. One very large, well-formed BO chondrule (apparent diameter 3.5 mm) is present in the studied thin section. Accessory phases are stained metal, chlorapatite, chromite and troilite.

Geochemistry: Olivine (Fa19.4±0.1, range Fa19.2-19.5, N = 7), low-Ca pyroxene (Fs16.9±0.2Wo1.3±0.2, range Fs16.7-17.4Wo0.9-1.5, N = 8).

Classification: Ordinary chondrite (H6).

Specimens: 22 g including one polished thin section at PSF; remainder with Mr. N. Oakes.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2006 Feb
Mass (g):322
Pieces:1
Class:H6
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):19.4±0.1
Ferrosilite (mol%):16.9±0.2
Wollastonite (mol%):1.3±0.2
Classifier:A. Irving, UWA and J. Boesenberg, BrownU
Type spec mass (g):22
Type spec location:PSF
Main mass:N. Oakes
Comments:Submitted by A. Irving
Institutions
   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)
UWA: University of Western Australia, 35 Hackett Drive, Crawley, Western Australia 6009, Australia (institutional address; updated 29 May 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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