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Allan Hills A79028
Basic information Name: Allan Hills A79028
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79028
This meteorite may also be called Allan Hills 79028 (ALH 79028) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 16.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  H6
Meteoritical Bulletin:  MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 6120 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 4(1):

Sample No.: ALHA79028

Location: Allan Hills

Field No.: 1154

Weight (gms) 16.2

Meteorite Type: H6 Chondrite

 

Physical Description: Roberta Score

Stone is totally covered with brown to black fusion crust. Chipping revealed a 1 mm thick weathering rind. The interior is light gray in color with reddish-brown oxidation scattered throughout. Dimensions: 2.5 x 2 x 1 cm.

 

Petrographic Description: Brian Mason

Chondrules are few and ill-defined, tending to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron, troilite, and plagioclase. Accessory merrillite was identified with the microprobe Fusion crust, up to 0.5 mm thick, rims part of the section. Minor weathering is indicated by limonitic staining around the nickel-iron grains. Microprobe analyses gave the following compositions: olivine, Fa18; pyroxene, Fs16; plagioclase, An11. The meteorite is classified as an H6 chondrite.

Data from:
  MB76
  Table 2
  Line 466:
Origin or pseudonym:Main icefield
Mass (g):16.3
Class:H6
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):16
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 4(1) (1981), 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° 42' 8"S, 159° 21' 58"E)
Note: the NHM and MetBase coordinates are 7.9 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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