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Allan Hills A78128
Basic information Name: Allan Hills A78128
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78128
This meteorite may also be called Allan Hills 78128 (ALH 78128) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 154.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
NIPR Catalogue:  2000 Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 9639 approved meteorites (plus 16 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78128

Location: Allan Hills

Field No.: 250

Weight (gms): 154.7

Meteorite Type: H5 Chondrite

 

Physical Description:

The sample is completely devoid of fusion crust. It is weathered and stained a dark reddish-brown and is shiny in some areas. On the B surface the specimen has some small spots that are nearly black, while in other areas the weathering is not as severe and chondrules (max. diameter 2 mm.) can be detected. The sample is extensively fractured. Chipping revealed only a slight amount of material that was not severely weathered.

 

Petrographic Description: Brian Mason

Chondritic structure moderately well developed, with chondrules ranging from 0.2-2.4 mm across; the commonest types are granular olivine, barred olivine, and fine-grained radiating pyroxene. The groundmass consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. The meteorite is extensively weathered, with much of the nickel-iron altered to brown limonite. Microprobe analyses give the following compositions: olivine, Fa19; orthopyroxene, Fs17 ; plagioclase, An 10. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 351:
Origin or pseudonym:Main icefield
Mass (g):154.7
Class:H5
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=34±2
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(2) (1980), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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