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Allan Hills A77273
Basic information Name: Allan Hills A77273
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77273
This meteorite may also be called Allan Hills 77273 (ALH 77273) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 492 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(3)  (1978)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 10989 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 1(3):
This text was reprinted from AMN 1(3) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77273

Location: Allan Hills

Field No.: Y78010511

Weight (gms): 492.0

Meteorite Type: L6 Chondrite

 

Physical Description:

Sample is not a complete stone. Black fusion crust remains on four surfaces of the angular specimen (~50% of the sample covered) which is less than 1 mm thick. The broken surface shows a light gray, fine-grained matrix with areas of iron oxide staining. This surface is only moderately weathered and shows small cracks. Chondrules are not prominent. Approximate size: 14x6.5x5 cm.

 

Petrographic Description: Brian Mason

Chondrules are few and poorly defined, tending to merge with the granular groundmass, which consists of subequal amounts of olivine and orthopyroxene, with minor amounts of plagioclase (~10%), nickel-iron (~8%), and troilite (~5%). Microprobe analyses show olivine (Fa24), orthopyroxene (Fs20), and plagioclase (An12) of essentially uniform composition. Limonitic staining pervades the section.

Data from:
  MB76
  Table 2
  Line 224:
Origin or pseudonym:Main icefield
Mass (g):492
Class:L6
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:26Al=39±2; 77272 pairing group
Catalogs:
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Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 1(3) (1978), 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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