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Allan Hills A77286
Basic information Name: Allan Hills A77286
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77286
This meteorite may also be called Allan Hills 77286 (ALH 77286) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 246 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 5782 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77286

Location: Allan Hills

Field No.: Y78010506

Weight (gms): 245.8

Meteorite Type: H4 Chondrite

 

Physical Description:

The B surface and portions of the N surface are devoid of fusion crust. The remaining surfaces have remnants of a thin black fusion crust. The surfaces that are devoid of fusion crust are rough on a small scale. It appears that many ~l mm inclusions produce the roughness. Chondrules and lithic clasts are present in the sample. Only one small fracture occurs on the T surface. No unweathered material was exposed when the sample was sawed. Dimensions:  ~7.5x5.5x3.5 cm.

 

Petrographic Description: Brian Mason

The section shows a close-packed aggregate of chondrules, 0.2-1.8 mm in diameter, with a relatively minor amount of matrix material. A variety of chondrule types is present, the commonest being granular olivine, olivine-pyroxene, and fine-grained pyroxene. Much of the granular pyroxene in chondrules is polysynthetically twinned clinobronzite. The matrix consists of fine-grained olivine and pyroxene with minor nickel-iron and troilite; some of the troilite occurs as rims to chondrules. The matrix is infiltrated with veinlets of red-brown limonite. Microprobe analyses show olivine of essentially uniform composition (Fs12-Fs16, average Fs14 [sic]). The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 236:
Origin or pseudonym:Main icefield
Mass (g):245.8
Class:H4
Weathering grade:C
Fayalite (mol%):17
Ferrosilite (mol%):12-16
Comments:26Al=54±4
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(1) (1980), 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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