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Meteorite Hills 00428
Basic information Name: Meteorite Hills 00428
     This is an OFFICIAL meteorite name.
Abbreviation: MET 00428
Observed fall: No
Year found: 2000
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 45.8 g
NHM Catalogue:  5th Edition  (2000)  Iron-ung
Antarctic Meteorite Newsletter:  AMN 24(2)  (2001)  Iron-ung
Meteoritical Bulletin:  MB 86  (2002)  Iron-ung
MetBase:  v. 7.1  (2006)  Iron-ung
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 145 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped.   [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
Writeup from AMN 24(2):
Sample No.: MET 00428
Location: Meteorite Hills
Field No.: 13040
Dimensions (cm):   3.5x2.5x1.5
Weight (g): 45.774
Meteorite Type: Iron-Ungrouped

Macroscopic Description: Kathleen McBride and Tim McCoy
This 45.8 g ellipsoidal specimen has a frothy exterior. One end of the specimen exhibits a rounded depression. The end of the mass appears as if it may have been torn from another piece during atmospheric passage.

Microscopic Description: Tim McCoy
The section is dominated by Fe, Ni metal with 10-20 vol.% of rounded, elongate and ellipsoidal troilite inclusions that range in size from 200 microns to 2 mm in maximum dimension, with most less than 1 mm. The section is bounded by an a2 structure produced during atmospheric heating that extends up to 2 mm into the interior of the meteorite. Rare fusion crust is present. The frothy exterior resulted from a combination of atmospheric ablation and terrestrial weathering of the troilite inclusions. The troilite inclusions exhibit multiple twinning from deformation. No silicate or chromite inclusions were observed. Swathing kamacite surrounds the troilite inclusions. In areas of relatively few troilite inclusions, a weak Widmanstatten pattern is observed, with very thin kamacite lamellae (100-120 microns wide). Kamacite exhibits numerous Neumann bands and these bands are subsequently bent or, in many cases, sheared by subsequent microfaults. Large areas between kamacite bands are dominated by net or finger plessite. The classification of this meteorite is uncertain. Most other troilite-rich meteorites (e.g., Mundrabilla, LEW 86211, Soroti) differ significantly. The closest relative may be the fine octahedrite Mont Dieu, which is a member of group IIE.

MET 00428 - Reflected-Polished Light MET 00428 - Reflected Light - Etched
Ref. Light - Polished Sur. Ref. Light - Etched Surface
Skip TS Images MET00428
MET 00428 - Ref. Light - Melted Troilite MET 00428 - Reflected Light - Troilite MET 00428 - Reflected Light - Etched Surface
Reflected Light - Melted Troilite Reflected Light - Troilite Reflected Light - Etched Surface
Data from:
  Table A1
  Line 32:
Mass (g):45.8
Class:Iron ung
Weathering grade:B
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References: Published in Antarctic Meteorite Newsletter 24(2) (2001), JSC, Houston
Published in Meteoritical Bulletin, no. 86, MAPS 37, A157-A184 (2002)
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Photographs from AMN:
Photograph from unknown source A photo is in the write-up above

     Catalogue of Meteorites:   (79° 41'S, 155° 45'E)
     Recommended::   (79° 41'S, 155° 45'E)

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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