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Graves Nunataks 98088
Basic information Name: Graves Nunataks 98088
     This is an OFFICIAL meteorite name.
Abbreviation: GRA 98088
Observed fall: No
Year found: 1998
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 64.6 g
Classification
  history:
NHM Catalogue:  5th Edition  (2000)  Eucrite-br
Antarctic Meteorite Newsletter:  AMN 23(1)  (2000)  Eucrite-br
Meteoritical Bulletin:  MB 84  (2000)  Eucrite-br
MetBase:  v. 7.1  (2006)  Eucrite
Recommended:  Eucrite-br    [explanation]

This is 1 of 167 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 23(1):
Sample No.: GRA 98006; 026; 033; 044;
054; 067; 088; 103;
131
Location: Graves Nunataks
Dimensions (cm):   6.5x6.0x2.5; 3.5x3.5x3.0; 6.0x4.0x3.0; 3.5x3.0x1.0;
6.0x4.5x3.5; 3.5x3.0x2.5; 4.0x4.0x2.5; 5.0x3.0x2.5;
3.5x2.0x2.0
Weight (g): 163.695; 68.39; 123.198; 27.476;
103.409; 53.182; 64.619; 41.084;
26.12
Meteorite Type: Eucrite (Brecciated)
     GRA98103
GRA 98103
     GRA98067
GRA 98067

Macroscopic Description: Kathleen McBride
These meteorites have shiny black fusion crusts with some small, dull patches where thinning has occurred due to weathering.  Some of the meteorites have shallow “vugs” that reveal coarse-grained tan to gray crystalline material as well as finer grained material.  Several rusty patches on the rocks’ exterior surface are visible. A few of the meteorites have greenish-gray elongated or radiating crystals with some areas of rusty discoloration.  The matrix on most is gray in color with clast colors ranging from white to tan to black.  Several of the clasts are rimmed with dark gray to black crystalline material.  GRA 98044 (27 g) has a fusion crust that is mostly dull covering about 40% of the surface area.  The matrix is gray in color with numerous charcoal gray inclusions and small rust halos.  These eucrites are very soft and friable.

Thin Section Description: Tim McCoy

GRA98026 GRA98044 GRA98054 GRA98067
GRA 98026 GRA 98044 GRA 98054 GRA 98067
GRA98088 GRA98103 GRA98131
GRA 98088 GRA 98103 GRA 98131

These meteorites consist of coarse-grained (mm-sized grains) basaltic clasts, which contain orthopyroxene (Fs64Wo2), with lamellae of augite (Fs28Wo44), and plagioclase (An88Or0.5).  Augite lamellae in GRA 98044 are 1-5 microns in width and a range of intermediate compositions was measured.  Shock effects include undulatory extinction in pyroxene and plagioclase.  The Fe/Mn ratio of the pyroxene is ~30.  The meteorites are brecciated eucrites.  They are paired with GRA 98006.  They are all coarse-grained, shocked, brecciated eucrites of similar composition.

Data from:
  MB84
  Table A1
  Line 89:
Origin or pseudonym:Lower Central
Mass (g):64.6
Class:Eu "Br"
Weathering grade:A/B
Ferrosilite (mol%):62
Comments:98006 pairing group
Catalogs:
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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:
CreditPhotos
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 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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