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Allan Hills A77288
Basic information Name: Allan Hills A77288
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77288
This meteorite may also be called Allan Hills 77288 (ALH 77288) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 1880 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(3)  (1978)  H6
Meteoritical Bulletin:  MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 5854 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H 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.: ALHA77288

Location: Allan Hills

Field No.: Y78010602

Weight (gms): 1880.0

Meteorite Type: H6 Chondrite

 

Physical Description:

The overall form of the specimen is angular. Four surfaces are rounded and smooth with a brown weathering rind and patches of dull black fusion crust ~1-2 mm thick. The other surfaces are fracture surfaces which also are covered with a brown weathering rind. Numerous fractures penetrate the stone. Inclusions are apparent on the severely weathered surfaces. Approximately 12.0x10.0x8.0 cm. No fresh metal or non-weathered surfaces observed in the process of obtaining material for thin sections or thermoluminescence studies. All surfaces exposed had a reddish-brown iron oxide staining.

 

Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, tending to merge with the granular groundmass, which is made up largely of olivine and orthopyroxene, with minor amounts of nickel-iron (~15%), plagioclase (~10%), and troilite (~5%). Microprobe analyses show olivine (Fa19), orthopyroxene (Fs17), and plagioclase (An12) of essentially uniform composition. The meteorite is considerably weathered, with pervasive limonitic staining throughout the section.

Data from:
  MB76
  Table 2
  Line 238:
Origin or pseudonym:Main icefield
Mass (g):1880
Class:H6
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=45±3; 77271 pairing group
Catalogs:
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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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