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Allan Hills A78111
Basic information Name: Allan Hills A78111
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78111
This meteorite may also be called Allan Hills 78111 (ALH 78111) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 126.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  Unclassified
AMN 4(2)  (1981)  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 9655 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 4(2):

Sample No.: ALHA78111

Location: Allan Hills

Field No.: 472

Weight (gms): 126.8

Meteorite Type: H5 Chondrite

Physical Description,:

Sample is wedge-shaped and has fusion crust along one edge. Remainder of sample may or may not have remnant fusion crust. One surface contains many chondrules which could be plucked out. Only a small area (0.6 cm) through the center of the stone is unweathered. The unweathered matrix is light gray in color. Some fresh metal is visible. When the meteorite was chipped, it broke into many pieces. Dimensions: 7.5 x 5.5 x 2 cm.

 

Petrographic Description: Brian Mason

The section shows well-developed chondritic structure, chondrules ranging from 0.3-1.2 mm across. Chondrule margins are sometimes diffuse, tending to merge with the granular groundmass, which consists largely of olivine end pyroxene, with minor amounts of nickel-iron and troilite and a little fine-grained plagioclase. The meteorite is somewhat weathered, with veins and patches of brown limonite throughout the section. Microprobe analyses gave the following compositions: olivine. Fa18; pyroxene, Fs16; plagioclase, An13. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 335:
Origin or pseudonym:Main icefield
Mass (g):126.8
Class:H5
Weathering grade:B/C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=53±3
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 4(2) (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° 43'S, 159° 40'E)

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