Meteoritical Bulletin: Entry for Graves Nunataks 98168

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Graves Nunataks 98168

Basic information

Name: Graves Nunataks 98168
This is an OFFICIAL meteorite name.
Abbreviation: GRA 98168
Observed fall: No
Year found: 1998
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 7 g

Classification
history:

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

This is 1 of 451 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Writeup

Writeup from AMN 23(1):

Sample No.:	GRA 98168
Location:	Graves Nunataks
Dimensions (cm):	2.5x1.0x1.5
Weight (g):	7.010
Meteorite Type:	Howardite

Macroscopic Description: Kathleen McBride
The exterior has dull brown/black fusion crust over 50% of its surface. The interior is a light gray matrix with some minor rust and millimeter sized tan inclusions.

Thin Section (, 2) Description: Tim McCoy
The section shows a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with coarse-grained clasts up to a few mm. The section is dominated by orthopyroxene of relatively constant composition (Fs_24-31Wo_2-7). A few grains of feldspar were analyzed (An_89-94Wo_0.3). Some of the pyroxene grains seem to exhibit submicron exsolution and this may explain the range in pyroxene compositions. The meteorite is probably a howardite, but contains relatively little eucritic material. It is probably not paired with GRA98030.

Data from:
  MB84
  Table A1
  Line 167:

Origin or pseudonym:	Lower Central
Mass (g):	7
Class:	How
Weathering grade:	A
Ferrosilite (mol%):	26

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
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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

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

Statistics:
This is 1 of 44547 approved meteorites from Antarctica (plus 3802 unapproved names)

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Revision
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