Meteoritical Bulletin: Entry for Northwest Africa 4298

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Northwest Africa 4298

Basic information

Name: Northwest Africa 4298
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4298
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 18 g

Classification
history:

Meteoritical Bulletin:	MB 92	(2007)	OC3
Recommended:			OC3 [explanation]

This is 1 of 10 approved meteorites classified as OC3. [show all]
Search for other: Ordinary chondrites, Ordinary chondrites (type 3)

Comments:

Approved 24 Jul 2007

Writeup

help

Writeup from MB 92:

Northwest Africa 4298

Morocco or Algeria

Find: September 2005

Ordinary chondrite (type 3)

History: Purchased from a Moroccan dealer in Erfoud by Adam Hupé in September 2005.

Physical characteristics:A single 18 g light brown stone lacking fusion crust and with abundant, large chondrules.

Petrography: (A. Irving and S. Kuehner, UWS): Very well formed and closely packed chondrules (mean diameter 1.5 mm).Chondrules (PO and POP) contain euhedral olivine or orthopyroxene crystals with Fe-enriched rims enclosed in glassy groundmass. Accessory kamacite (some as spherical grains in chondrules), taenite and troilite. The content of metal (+ minor Fe hydroxide) is very low (mode determined by BSE imaging of a whole thin section is 2 vol%).
Geochemistry: Olivine (Fa_0-46); Oxygen Isotopes: (D. Rumble, CIW) Analyses of two acid-washed whole rock fragments by laser fluorination gave, respectively, δ¹⁸O = 5.96, 5.57; δ¹⁷O = 3.78, 3.51; Δ¹⁷O = 0.639, 0.573 (all ‰). Although these Δ¹⁷O values are within the range for H chondrites, this specimen is much too poor in metal to be an H chondrite.

Classification: Ordinary chondrite (type 3); S1, W1/2.

Specimens: A total of 4 g of sample and one polished thin section are on deposit at UWS. AHupé holds the main mass.

Data from:
  MB92
  Table 2
  Line 25:

Place of purchase:	Efroud, Morocco
Date:	Sept-2005
Mass (g):	18
Pieces:	1
Class:	OC (type 3)
Type spec mass (g):	4

Plots:

O isotopes:

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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