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Allan Hills A77061
Basic information Name: Allan Hills A77061
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77061
This meteorite may also be called Allan Hills 77061 (ALH 77061) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 12.6 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 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.: ALHA77061

Location: Allan Nil

Field No.: 77122789

Weight (gms): 12.61

Meteorite Type: H5 Chondrite


Physical Description:

Approximately one-half of the specimen's surface is covered by a thin, brownish-black fusion crust. The other half of the specimen is a light-to-medium fracture surface with appreciable iron oxide staining. Chondrules appear present on fractured surface, however, they are not prominent. This is not a complete stone. From field photographs it is apparent that the B surface was in contact with the ice. Maximum dimension is approximately 2.5 cm.


Petrographic Description: Brian Mason

Chondrules numerous but poorly defined, their margins merging with the granular groundmass; a variety of types is present, including porphyritic olivine, barred olivine, radiating pyroxene, and others. Fusion crust is present on one edge. The section is pervaded with a moderate amount of yellow-brown limonitic staining, concentrated around grains of nickel-iron; occasional discrete patch brown limonite are present. Microprobe analyses show uniform olivine (Fa18) and orthopyroxene (Fs17) compositions; some small grains of sodic plagioclase were also detected.

Data from:
  Table 2
  Line 55:
Origin or pseudonym:Main icefield
Mass (g):12.6
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):17
Comments:77021 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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