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Allan Hills A77264
Basic information Name: Allan Hills A77264
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77264
This meteorite may also be called Allan Hills 77264 (ALH 77264) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 11 g
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 10945 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.: ALHA77264

Location: Allan Hills

Field No.: B78010301

Weight (gms): 10.97

Meteorite Type: H5 Chondrite


Physical Description:

The stone is tabular with well-defined edges and is completely covered by a slightly glassy, brownish-black fusion crust. One surface shows cracks that have weathered rusty, and a cavity which is a nearly perfect hemisphere. Chipping for a thin section sample revealed a fresh surface containing rust stains and fresh metal particles. The approximate dimensions of sample: 2.75x2.0x1.5 cm.


Petrographic Description: Brian Mason

Chondrules are prominent and well-defined, 0.3-1.2 in diameter; porphyritic olivine, barred olivine, and radiating pyroxene chondrules were noted. The matrix is medium-grained (grains up to 0.2 mm), and consists largely of olivine and pyroxene, with minor amounts of nickel-iron, troilite, and plagioclase; the plagioclase occurs as small grains in the matrix and in the bars of some chondrules. Fusion crust, up to 1 mm thick, is preserved on one edge. The sections show extensive limonitic staining, and limonite is concentrated around nickel-iron grains. Microprobe analyses give a mean composition of Fa19 for olivine and Fs16 for orthopyroxene. The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 215:
Origin or pseudonym:Main icefield
Mass (g):11
Weathering grade:A/B
Fayalite (mol%):19
Ferrosilite (mol%):16
Comments:77014 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 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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