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Allan Hills A77118
Basic information Name: Allan Hills A77118
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77118
This meteorite may also be called Allan Hills 77118 (ALH 77118) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 7.8 g
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  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 10899 approved meteorites (plus 19 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)
Writeup from AMN 4(1):

Sample No.: ALHA77118

Location: Allan Hills

Field No.: 77123118

Weight (gms): 7.84

Meteorite Type: H5 Chondrite


Physical Description:

Specimen is rounded. A brownish-black fusion crust covers approximately 75% of the meteorite's surface. Approximately 25% of the specimen is a fracture surface. This is a nearly complete specimen. No fresh metal was observed on chipping. The maximum dimension is ~2.5 cm. From field photographs it is evident that the B surface was in contact with the ice.


Petrographic Description: Brian Mason

Chondritic structure well-developed, with a variety of chondrule types, the commonest being barred olivine, granular and porphyritic olivine, and fine-grained pyroxene. The matrix is fine- to medium-grained, consisting of olivine, pyroxene, nickel-iron, and troilite. Fusion crust is present on one side of the section. The section is pervaded by yellow-brown limonitic material. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs17) of uniform composition; some small grains of sodic plagioclase were detected.

Data from:
  Table 2
  Line 93:
Origin or pseudonym:Main icefield
Mass (g):7.8
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=53±5; 77118 pairing group
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 43352 approved meteorites from Antarctica (plus 3802 unapproved names)
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