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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:help 7 g
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 427 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
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
GRA 98168 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 (Fs24-31Wo2-7).  A few grains of feldspar were analyzed (An89-94Wo0.3).  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:
  Table A1
  Line 167:
Origin or pseudonym:Lower Central
Mass (g):7
Weathering grade:A
Ferrosilite (mol%):26
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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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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   

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

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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