Meteoritical Bulletin: Entry for Graves Nunataks 98050

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Graves Nunataks 98050

Basic information

Name: Graves Nunataks 98050
This is an OFFICIAL meteorite name.
Abbreviation: GRA 98050
Observed fall: No
Year found: 1998
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 337 g

Classification
history:

NHM Catalogue:	5th Edition	(2000)	H3.8
Antarctic Meteorite Newsletter:	AMN 23(1)	(2000)	H3.8
Meteoritical Bulletin:	MB 84	(2000)	H3.8
MetBase:	v. 7.1	(2006)	H3.8
Recommended:			H3.8 [explanation]

This is 1 of 78 approved meteorites classified as H3.8. [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Writeup

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Writeup from AMN 23(1):

Sample No.:	GRA 98023; 024; 050; 087
Location:	Graves Nunataks
Dimensions (cm):	5.5x3.5x4.0; 4.0x3.0x2.0; 7.5x6.5x3.5; 3.5x2.0x1.5
Weight (g):	136.717; 59.072; 337.4; 22.250
Meteorite Type:	H3 Chondrite (estimated subtype 3.8)

gra98023-024

Macroscopic Description: Kathleen McBride
These meteorites have small patches of black fusion crust on a rough, rusty brown exterior. Areas without fusion crust are rusty brown with penetrating fractures. The interiors are fine-grained and rusty with large fractures and a high metal content. Some gray and weathered chondrules are visible.

Thin Section Description: Tim McCoy


GRA 98023	GRA 98024	GRA 98050	GRA 98087

A single description suffices for these meteorites. The sections exhibit numerous small, well-defined chondrules (up to 1.5 mm) in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is extremely abundant. The meteorites are highly weathered. Silicates are unequilibrated; olivines range from Fa_3-33, with most grains Fa₁₈, and pyroxenes from Fs_4-16. The meteorites are H3 chondrites (estimated subtype 3.8).

Data from:
  MB84
  Table A1
  Line 51:

Origin or pseudonym:	Inuksuq SW
Mass (g):	337.4
Class:	H3.8
Weathering grade:	C
Fayalite (mol%):	4-20
Ferrosilite (mol%):	16
Comments:	98023 pairing group

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):

References:

Published in Antarctic Meteorite Newsletter 23(1) (2000), JSC, Houston
Published in Meteoritical Bulletin, no. 84, MAPS 35, A199-A225 (2000)

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Photos:

Credit	Photos
Photographs from AMN:
Photograph from unknown source	A photo is in the write-up above
Photos from the Encyclopedia of Meteorites:
Dr Carlton Allen, JSC-KT, NASA

Geography:

Antarctica

Antarctica

Coordinates:
Catalogue of Meteorites:	(86° 43'S, 141° 30'W)
Recommended::	(86° 43'S, 141° 30'W)

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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