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Graves Nunataks 98098
Basic information Name: Graves Nunataks 98098
     This is an OFFICIAL meteorite name.
Abbreviation: GRA 98098
Observed fall: No
Year found: 1998
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 779 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 22(2)  (1999)  Eucrite-unbr
NHM Catalogue:  5th Edition  (2000)  Eucrite-unbr
Meteoritical Bulletin:  MB 84  (2000)  Eucrite-unbr
MetBase:  v. 7.1  (2006)  Eucrite-cm
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 89 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 22(2):
Sample No.: GRA 98098
Location: Graves Nunataks
Dimensions (cm):   10.0x6.8x5.5
Weight (g): 779.2
Meteorite Type: Eucrite
    GRA98098,0 Thumbnail GRA98098,0 & ,1 Thumbnail     All Images

Macroscopic Description: Katlheen McBride
The exterior of this meteorite is coarse grained and crystalline with white linear, criss-crossing veins of sugary textured material. The matrix consists of reddish-brown crystals, milky white feldspar crystals, some euhedral and gray translucent crystals. Some thin black patches of shiny fusion crust are present (about 10%). The interior is similar to the exterior except the interior veins are more yellowish in color.

Thin Section (,18) Description: Tim McCoy

Skip TS Images GRA98098
GRA98098,16 - Cross-Polarized Light - Silica Grain GRA98098,18 - Cross-Polarized Light - Normal Part GRA98098,18 - Cross-Polarized Light - White Vein GRA980988,18 - Cross-Polarized Light - Fusion Crust
,16 - Silica Grain ,18 - Normal Part ,18 - White "vein" ,18 - Fusion Crust

The section consists dominantly of a mixture of mm-sized orthopyroxene (Fs59Wo5), with 1-5 micron lamellae of augite (Fs35Wo33), and plagioclase (An89Or0.5). The Fe/Mn ratio of the pyroxene is ~31. A sub-equal mixture of plagioclase and SiO2 with minor pyroxene dominates the white veins seen in hand sample. The dominant opaques are Fe, Ti-and Fe,Ti,Cr,Al-oxides with minor iron sulfide and rare iron metal. The meteorite is a eucrite.

Oxygen Isotope Analysis: Robert Clayton
The oxygen isotope analysis of GRA98098 is d 18O=+3.3; d 17O=+1.4. This is a typical HED composition.

Data from:
  MB84
  Table A1
  Line 99:
Origin or pseudonym:Lower Central
Mass (g):779.2
Class:Eu "Ub"
Weathering grade:B
Ferrosilite (mol%):59
Plots: O isotopes:  
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 22(2) (1999), 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 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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