Meteoritical Bulletin: Entry for Graves Nunataks 98028

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Graves Nunataks 98028

Basic information

Name: Graves Nunataks 98028
This is an OFFICIAL meteorite name.
Abbreviation: GRA 98028
Observed fall: No
Year found: 1998
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 22.4 g

Classification
history:

NHM Catalogue:	5th Edition	(2000)	Acapulcoite
Antarctic Meteorite Newsletter:	AMN 23(1)	(2000)	Acapulcoite
Meteoritical Bulletin:	MB 84	(2000)	Acapulcoite
MetBase:	v. 7.1	(2006)	Acapulcoite
Recommended:			Acapulcoite [explanation]

This is 1 of 93 approved meteorites classified as Acapulcoite. [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites

Writeup

Writeup from AMN 23(1):

Sample No.:	GRA 98028
Location:	Graves Nunataks
Dimensions (cm):	4.0x2.0x1.0
Weight (g):	22.440
Meteorite Type:	Acapulcoite

Macroscopic Description: Kathleen McBride
A shiny, black fusion crust covers 90% of the exterior surface of this meteorite. The interior matrix is fine-grained and rusty and has a high metal content. It is very coherent.

Thin Section (, 2) Description: Tim McCoy
The section consists of an aggregate of fine-grained (0.25 mm grain size) olivine (Fa_8-9), orthopyroxene (Fs_8-10Wo_1-2), augite (Fs₅Wo₄₆), plagioclase, metal and troilite. Relict chondrules are present. Shock effects are minimal. The meteorite is an acapulcoite. The abundance of relict chondrules and paucity of micron-sized metal-sulfide veins are unusual for this group. The meteorite is not paired with GRA 95209.

Data from:
  MB84
  Table A1
  Line 29:

Origin or pseudonym:	Lower Central
Mass (g):	22.4
Class:	Acap
Weathering grade:	C
Fayalite (mol%):	8-9
Ferrosilite (mol%):	8-10

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:

Credit	Photos
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 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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