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Allan Hills A77071
Basic information Name: Allan Hills A77071
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77071
This meteorite may also be called Allan Hills 77071 (ALH 77071) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 10.9 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.: ALHA77071

Location: Allan Hills

Field No.: 77122711

Weight (gms): 10.87

Meteorite Type: H5 Chondrite

 

Physical-Description:

A relatively smooth brownish-black fusion crust covers approximately 50% of the sample. The remaining surfaces are fracture faces. These surfaces are brown, moderately weathered and show iron oxide staining. Approximate maximum length is 2.0 cm.

 

Petrographic Description: Brian Mason

This meteorite is similar in texture, mineral composition, and degree of weathering to ALHA77061, 77062, and 77064, which suggests that these stones may be separate pieces of the same meteorite.

Data from:
  MB76
  Table 2
  Line 62:
Origin or pseudonym:Main icefield
Mass (g):10.9
Class:H5
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):17
Comments:26Al=55±6; 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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