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Allan Hills A77144
Basic information Name: Allan Hills A77144
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77144
This meteorite may also be called Allan Hills 77144 (ALH 77144) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 7.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  H6
Meteoritical Bulletin:  MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
NIPR Catalogue:  2000 Edition  (2000)  H6
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 5854 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.: ALHA77144

Location: Allan Hills

Field No.: 77123106

Weight (gms): 7.88

Meteorite Type: H6 Chondrite

 

Physical Description:

The specimen is rounded with a thin, patchy fusion crust covering ~75% of the stone's surface. The remainder of the stone is covered by a reddish-brown weathering rind. This appears to be a complete specimen. Its maximum dimension is ~2 cm. After chipping it was determined that the meteorite is weathered throughout.

 

Petrographic Description: Brian Mason

Chondritic structure not prominent, the rather sparse chondrules merging with the granular groundmass, which consists of olivine, pyroxene, nickel-iron, and troilite, with accessory chromite. A moderate amount of limonitic staining is concentrating around nickel-iron grains. Fusion crust is present on one edge. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs17) of uniform composition; medium-grained sodic plagioclase was also seen.

Data from:
  MB76
  Table 2
  Line 113:
Origin or pseudonym:Main icefield
Mass (g):7.9
Class:H6
Weathering grade:B
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=56±6; 77144 pairing group
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° 43'S, 159° 40'E)

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