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Allan Hills A77062
Basic information Name: Allan Hills A77062
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77062
This meteorite may also be called Allan Hills 77062 (ALH 77062) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 16.7 g
Classification
  history:
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 9648 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(1):

Sample No.: ALHA77062

Location: Allan Hills

Field No.: 77122784

Weight (gms): 16.72

Meteorite Type: H5 Chondrite

 

Physical Description:

Specimen is angular. Approximately 1/2 surface is covered with a thin, brownish-black fusion crust. A light to medium gray fracture surface comprises the remaining 50% of the meteorite's exterior surface. Iron oxide staining is on the fracture surface, but not to the extent that it obliterates the detection of chondrules and other inclusions. Irregular white inclusions, probably feldspar, approximately 2 cm in length are present. Near one of these inclusions is a 1/2 cm area devoid of weathered metal fragments. From field photographs it appears that the T surface was in contact with the ice. Maximum dimension of sample is approximately 2.75 cm.

 

Petrographic Description: Brian Mason

This meteorite is similar in texture, mineral composition, and degree weathering to Allan Hills 77061 and 77064, which suggests that these three stones may be separate pieces of the same meteorite.

Data from:
  MB76
  Table 2
  Line 56:
Origin or pseudonym:Main icefield
Mass (g):16.7
Class:H5
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):17
Comments:26Al=47±5; 77021 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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