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Graves Nunataks 98108
Basic information Name: Graves Nunataks 98108
     This is an OFFICIAL meteorite name.
Abbreviation: GRA 98108
Observed fall: No
Year found: 1998
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 12.7 g
NHM Catalogue:  5th Edition  (2000)  Diogenite
Antarctic Meteorite Newsletter:  AMN 23(1)  (2000)  Diogenite-olivine
Meteoritical Bulletin:  MB 84  (2000)  Diogenite-olivine
MetBase:  v. 7.1  (2006)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 510 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Writeup from AMN 23(1):
Sample No.: GRA 98108
Location: Graves Nunataks
Dimensions (cm):   2.0x2.0x2.0
Weight (g): 12.678
Meteorite Type: Diogenite (Olivine)
GRA 98108
GRA 98108

Macroscopic Description: Kathleen McBride
The exterior surface of this meteorite has small patches of rough, black fusion crust (5% of surface area).  The exposed interior is yellowish-green, coarse-grained olivine crystals.  There are some areas that appear to be rust stained or have rootbeer (pyroxene?) colored minerals.  The olivine crystals are opaque to transparent.  Freshly broken faces show transparent, white crystalline (plagioclase?) material with coarser-grained olivine.  Single grains are several mm in length.  Individual crystal faces are visible as well as cleavage planes.  There are several rusty areas where minerals are stained.  Maroon colored minerals and small black specks are distributed throughout the rock.

Thin Section (, 5) Description: Tim McCoy
GRA 98108 The section contains both finer-grained (0.2-0.5 mm grain size) equigranular areas of olivine, orthopyroxene and rare plagioclase with 120º triple junctions, and coarser (up to 5 mm) grains of orthopyroxene and olivine intergrown with ragged boundaries.  Orthopyroxene is the more abundant phase.  Olivine is Fa27, orthopyroxene is Fs22Wo 2 and plagioclase is An89.  The Fe/Mn ratio is ~27.  Opaque phases comprise only a few percent of the rock and include troilite, chromite and rare metal.  It is moderately shocked.  It is an unusual achondrite, and is most likely an olivine diogenite.

Data from:
  Table A1
  Line 109:
Origin or pseudonym:Lower Central
Mass (g):12.7
Class:Ol Diog
Weathering grade:B
Fayalite (mol%):27
Ferrosilite (mol%):22
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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 43840 approved meteorites from Antarctica (plus 3802 unapproved names)
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