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Allan Hills A77074
Basic information Name: Allan Hills A77074
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77074
This meteorite may also be called Allan Hills 77074 (ALH 77074) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 12.1 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 9646 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.: ALHA77074

Location: Allan Hills

Field No.: 77122721

Weight (gms): 12.07

Meteorite Type: H5 Chondrite

 

Physical Description:

The stone is moderately angular. Approximately 70% of the sample's exterior surface is covered by a brownish-black fusion crust. The remaining surfaces are fracture-surfaces that are yellowish-brown and severely weathered. An irregular cavity ~4 mm diameter is present on one fracture surface. Chipping for a thin section sample revealed fresh metal fragments on the interior. Approximate maximum dimension is 2.5 cm.

 

Petrographic Description: Brian Mason

This meteorite is similar in texture, mineral composition, and degree of weathering to Allan Hills 77061, 77062, 77064, and 77071, which suggests that these stones may be separate pieces of the same meteorite.

Data from:
  MB76
  Table 2
  Line 64:
Origin or pseudonym:Main icefield
Mass (g):12.1
Class:H5
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):17
Comments: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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