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Allan Hills A77009
Basic information Name: Allan Hills A77009
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77009
This meteorite may also be called Allan Hills 77009 (ALH 77009) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 236 g
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 6415 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77009

Location: Allan Hills

Field No.: 77122943

Weight (gms): 235.5

Meteorite Type: H4 Chondrite


Physical Description:

This is a complete specimen with fusion crust missing only on the corners and one small area on the T surface. The fusion crust, where present, is approximately 0.5 mm thick and black. On the surfaces not covered by fusion crust, many weathered inclusions are present. An ~0.5 cm green inclusion, that appears to radiate, is present on the T surface. Much of the interior of the sample has weathered to a reddish-brown. Dimensions: ~6.5x4.5x4.3 cm.


Petrographic Description: Brian Mason

Chondritic structure is prominent. The usual variety of chondrule types is present, the commonest being barred olivine, granular olivine, and fine-grained radiating pyroxene. In a few of the barred chondrules the bars between the olivine are transparent brown glass, but in most the bars are turbid and devitrified. Some of the pyroxene is polysynthetically twinned clinobronzite. The groundmass between the chondrules consists of granular olivine and pyroxene, with minor amounts of nickel-iron and troilite. Remnants of fusion crust are present on one edge of the section. Microprobe analyses show olivine (Fa18) and pyroxene (Fs16) of essentially uniform composition. The meteorite is classified as an H4 chondrite.

Data from:
  Table 2
  Line 17:
Origin or pseudonym:Main icefield
Mass (g):235.5
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=32±2; 77009 pairing group
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References: Published in Antarctic Meteorite Newsletter 3(1) (1980), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
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