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Mount Howe 88403
Basic information Name: Mount Howe 88403
     This is an OFFICIAL meteorite name.
Abbreviation: HOW 88403
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 2.48 kg
Antarctic Meteorite Newsletter:  AMN 13(2)  (1990)  Iron-ataxite-an
AMN 17(1)  (1994)  Iron-ung
Meteoritical Bulletin:  MB 76  (1994)  Iron-ung
NHM Catalogue:  5th Edition  (2000)  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 13(2):

Sample No. HOW 88403

Location: Mt. Howe

Dimensions (cm): 11.5x7.0x7.0

Field Number: none

Weight (g): 2470

Meteorite Type: Anomalous Ataxite


Macroscopic Description: V.F. Buchwald and R.S. Clarke. Jr.

The meteorite was found by a research group under the direction of Dr. Charles Swithinbank on the blue ice field at Mt. Howe, Antarctica. It is blocky in shape with smoothly rounded edges, and its surfaces are dark brown in color with a slightly reddish tinge. The surface is unusual in appearance, having a texture of densely spaced pin holes due to selective corrosion and interior structure. Flow structure is present in the fusion crust suggesting that the domed or most rounded surface was the anterior surface during atmospheric entry.


Polished Section Description: V.F. Buchwald and R.S. Clarke. Jr.

A polished section of 20 cm2 was prepared from a slice that was taken perpendicular to the long axis of the specimen and ~15 mm from its smaller end. The appearance of this surface suggests a metal-sulfide eutectic, with ~2/3 metal and ~1/3 sulfide. It is a fine grained structure with individual sulfide cells ranging around 0.3 mm across. A thin fusion crust is present, underlain by a 2-3 mm heat-altered zone. The metal matrix is ataxitic, decomposing into a very fine grained mixture of taenite and kamacite with abundant small schreibersites. Troilite is surrounded by discontinuous rims of schreibersite, and an occasional chromite was observed in the sulfide. The specimen is an anomalous sulfide-rich ataxite.


Data from:
  Table 2
  Line 2871:
Mass (g):2480.7
Class:Iron ung
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References: Published in Antarctic Meteorite Newsletter 13(2) (1990), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (87° 22'S, 149° 30'W)
     Recommended::   (87° 22'S, 149° 30'W)

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