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Allan Hills A77300
Basic information Name: Allan Hills A77300
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77300
This meteorite may also be called Allan Hills 77300 (ALH 77300) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 235 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 9649 approved meteorites (plus 16 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H 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.: ALHA77300

Location: Allan Hills

Field No.: 77123024

Weight (gms): 234.5

Meteorite Type: H5 Chondrite

 

Physical Description:

The stone is 9.0x5.0x4.5 cm and oblong. Half the surface appears to have had fusion crust that has been mostly ablated, leaving only dull, brown remnant patches. Half the specimen has a rough fracture surface. The exterior is uniformly weathered a dark orangish-brown. When the sample was cleaved in half, no unweathered material was exposed. The severity of the weathering caused the sample to crumble into many pieces during handling for photography.

 

Petrographic Description: Brian Mason

Chondritic structure is moderately well-developed, but chondrules tend to merge with the granular groundmass, which consists largely of olivine and orthopyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). The meteorite is extensively weathered, with veinlets and patches of limonite throughout. Microprobe analyses show olivine (Fa18) and orthopyroxene (Fs16) of uniform composition. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 249:
Origin or pseudonym:Main icefield
Mass (g):234.5
Class:H5
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=54±4
Catalogs:
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Search for this meteorite in the NASA/JSC database (U.S.):   
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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