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Allan Hills A77124
Basic information Name: Allan Hills A77124
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77124
This meteorite may also be called Allan Hills 77124 (ALH 77124) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 4.4 g
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  H6
AMN 4(1)  (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 10910 approved meteorites (plus 20 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.: ALHA77124

Location: Allan Hills

Field No.: 77123119

Weight (gms): 4.41

Meteorite Type: H5 Chondrite


Physical Description:

Specimen is rounded and nearly completely covered with a thin, weathered fusion crust. From field photographs it is known that the B surface was in contact with the ice. The maximum dimension of the specimen is ~1.5 cm. No fresh metal was observed when the sample was chipped to obtain a thin section sample.


Petrographic Description: Brian Mason

Chondrules sparse and not easily distinguished from the granular groundmass, which consists of olivine, pyroxene, nickel-iron, and troilite; accessory chromite is present. Yellow-brown limonitic staining pervades the section. Fusion crust is present on one edge. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs16) of uniform composition; grains of sodic plagioclase were detected.

Data from:
  Table 2
  Line 97:
Origin or pseudonym:Main icefield
Mass (g):4.4
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):16
Comments:26Al=70±7; 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 43500 approved meteorites from Antarctica (plus 3802 unapproved names)
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