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Graves Nunataks 98023
Basic information Name: Graves Nunataks 98023
     This is an OFFICIAL meteorite name.
Abbreviation: GRA 98023
Observed fall: No
Year found: 1998
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 136.7 g
NHM Catalogue:  5th Edition  (2000)  H3.8
Antarctic Meteorite Newsletter:  AMN 23(1)  (2000)  H3.8
Meteoritical Bulletin:  MB 84  (2000)  H3.8
MetBase:  v. 7.1  (2006)  H3.8
Recommended:  H3.8    [explanation]

This is 1 of 78 approved meteorites classified as H3.8.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeup from AMN 23(1):
Sample No.: GRA 98023; 024; 050; 087
Location: Graves Nunataks
Dimensions (cm):   5.5x3.5x4.0; 4.0x3.0x2.0; 7.5x6.5x3.5; 3.5x2.0x1.5
Weight (g): 136.717; 59.072; 337.4; 22.250
Meteorite Type: H3 Chondrite (estimated  subtype 3.8)

Macroscopic Description: Kathleen McBride
These meteorites have small patches of black fusion crust on a rough, rusty brown exterior. Areas without fusion crust are rusty brown with penetrating fractures.  The interiors are fine-grained and rusty with large fractures and a high metal content.  Some gray and weathered chondrules are visible.

Thin Section Description: Tim McCoy

GRA980223 GRA98024 GRA98050 GRA98087
GRA 98023 GRA 98024 GRA 98050 GRA 98087

A single description suffices for these meteorites.  The sections exhibit numerous small, well-defined chondrules (up to 1.5 mm) in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is extremely abundant.  The meteorites are highly weathered.  Silicates are unequilibrated; olivines range from Fa3-33, with most grains Fa18, and pyroxenes from Fs4-16.   The meteorites are H3 chondrites (estimated subtype 3.8).

Data from:
  Table A1
  Line 24:
Origin or pseudonym:Lower Central
Mass (g):136.7
Weathering grade:B
Fayalite (mol%):3-33
Ferrosilite (mol%):4-9
Comments:98023 pairing group
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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 43857 approved meteorites from Antarctica (plus 3802 unapproved names)
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