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Allan Hills A77284
Basic information Name: Allan Hills A77284
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77284
This meteorite may also be called Allan Hills 77284 (ALH 77284) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 376 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.: ALHA77284

Location: Allan Hills

Field No.: Y78010501

Weight (gms): 376.2

Meteorite Type: L6 Chondrite

 

Physical Description:

The fusion crust on this angular stone is less than .5 mm thick, dull black, and covers all but the B surface, which is a planar fracture surface. Rounded and irregular clasts are visible in some areas on the B surface. One large fracture runs the length of the sample. The specimen is approximately 11.0x8.0x3.5 cm. The material exposed during chipping to obtain a thin section sample, is grayish-white and exhibits a few small metallic flakes. A thin, 1 mm, weathering rind is apparent along the T, S, and N surfaces.

 

Petrographic Description: Brian Mason

The thin section shows sparse chondrules with indistinct borders merging with the granular groundmass, which consists largely of olivine and orthopyroxene, with minor subequal amounts of nickel-iron and troilite, and a little untwinned plagioclase. Some limonite is present, mainly in association with the nickel-iron. Microprobe analyses show olivine (Fa25), orthopyroxene (Fs21), and plagioclase (An11) of uniform composition; one grain of apatite was identified with the microprobe. The meteorite is classified as an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 234:
Origin or pseudonym:Main icefield
Mass (g):376.2
Class:L6
Weathering grade:A/B
Fayalite (mol%):25
Ferrosilite (mol%):21
Comments:26Al=45±5
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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