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Graves Nunataks 98019
Basic information Name: Graves Nunataks 98019
     This is an OFFICIAL meteorite name.
Abbreviation: GRA 98019
Observed fall: No
Year found: 1998
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 95.5 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 164 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 23(1):
Sample No.: GRA98 019; 037; 039; 042; 043; 052; 055; 097; 113; 114; 157; 158; 159
Location: Graves Nunataks
Dimensions (cm):   5.0x6.0x3.0; 6.0x4.5x4.0; 5.5x4.0x3.5; 5.5x4.0x3.5;
4.5x4.0x3.5; 5.0x3.0x2.5; 6.0x3.5x4.0; 2.5x2.0x1.5;
4.5x5.0x2.5; 5.5x3.5x2.5; 4.5x2.5x2.0; 4.5x4.5x2.5;
5.0x2.5x2.5
Weight (g): 95.52; 107.859; 72.81; 92.637;
102.931; 63.578; 140.75; 12.941;
63.713; 58.748; 39.194; 66.878;
33.875
Meteorite Type: Eucrite (Brecciated)

GRA98019 GRA98037 GRA98055
GRA 98019 GRA 98037 GRA 98055


Macroscopic Description: Kathleen McBride
These fine-grained achondrites vary in color from gray to tan to greenish and also contain various colored clasts.  All possess varying amounts of fusion crust that is brown-black in color and usually contains small shiny patches.  Most of them are “vuggy” and show varying degrees of weathering.  Thin, black glassy veins are visible in the matrix.  Some (usually the greenish ones) have areas of rusty-red minerals that have stained the adjacent minerals red.

Thin Section Description: Tim McCoy

GRA98019 GRA98037 GRA98039 GRA98042 GRA98043 GRA98052
GRA 98019 GRA 98037 GRA 98039 GRA 98042 GRA 98043 GRA 98052
GRA98097 GRA98113 GRA98114 GRA98157 GRA98158 GRA98159
GRA 98097 GRA 98113 GRA 98114 GRA 98157 GRA 98158 GRA 98159

These meteorites are dominated by fine-grained (~200 micron average grain size) basaltic material which occurs as both the host and clasts within these meteorites.  Occasional coarser-grained clasts, with grain sizes up to 0.5 mm, are observed in some members of the group, including GRA 98042, GRA 98052 and GRA 98055.  Mineral compositions are similar and homogeneous with orthopyroxene (Fs64Wo2), with lamellae of augite (Fs28Wo44), and plagioclase (An89Or0.5). The Fe/Mn ratio of the pyroxene is ~28.  The meteorites are brecciated eucrites.

Data from:
  MB84
  Table A1
  Line 20:
Origin or pseudonym:Lower Central
Mass (g):95.5
Class:Eu "Br"
Weathering grade:B
Ferrosilite (mol%):64
Comments:98019 pairing group
Catalogs:
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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:
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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