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Allan Hills A77226
Basic information Name: Allan Hills A77226
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77226
This meteorite may also be called Allan Hills 77226 (ALH 77226) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 15.32 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 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(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77226

Location: Allan Hills

Field No.: 77122901

Weight (gms): 15323.0

Meteorite Type: H4 Chondrite

 

Physical Description:

A small patch of dull black fusion crust was present on the S surface of the sample. The W surface of the specimen was concave and flow bands were present in the T-B direction. The specimen is severely fractured and during processing crumbled into many pieces. Nearly all the material exposed during processing was extensively stained by iron-oxidation. However, a few small areas on the exposed material are not as severely stained by iron oxidation and appear light gray.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, with chondrules ranging from 0.3-1.8 mm in diameter; they are set in a fine-grained granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Some of the pyroxene is polysynthetically twinned clinobronzite. Brown limonitic staining pervades the section. Microprobe analyses show olivine (Fa18) and pyroxene (Fs16) of essentially uniform composition. The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 182:
Origin or pseudonym:Near Western
Mass (g):15323
Class:H4
Weathering grade:Ce
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=59±3; 77004 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(2) (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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