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Allan Hills A77296
Basic information Name: Allan Hills A77296
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77296
This meteorite may also be called Allan Hills 77296 (ALH 77296) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 963 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  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 2(1):
This text was reprinted from AMN 2(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77296

Location: Allan Hills

Field No.: 78010211B

Weight (gms): 963.3

Meteorite Type: L6 Chondrite

 

Physical Description:

Remnants of fusion crust are present on the N surface of this angular specimen. The crust is a dull, orangish-brown, covers approximately 15% of the sample and is 1 mm thick. The B surface appears to have had the fusion crust removed; it is smoother than the remaining surfaces, which are fracture surfaces. The matrix is light gray and has iron oxidation associated with the included metallic particles. Both chondrules and lithic clasts, darker and lighter than the matrix material, are present. On the W surface, there is a subrounded, gray clast that is more than 1 cm in length. The specimen is 13.0 x 9.5 x 5.0 cm.  In the field photographs of this sample, another specimen (ALHA77292) is also present, thus, perhaps, indicating that they are a paired fall.

 

Petrographic Description:

The section shows sparse and ill-defined chondrules set in a granular matrix of olivine and orthopyroxene, with minor amounts of nickel-iron, troilite, and untwinned plagioclase. A small amount of limonitic staining is associated with the metal grains. Microprobe analyses show olivine (Fa24), orthopyroxene (Fs21), and plagioclase (An11) of uniform composition. The meteorite is classified as an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 246:
Origin or pseudonym:Main icefield
Mass (g):963.3
Class:L6
Weathering grade:A/Be
Fayalite (mol%):24
Ferrosilite (mol%):21
Comments:26Al=67±4; NTL=1.54±0.08; 77001 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 2(1) (1979), 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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