MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 27 Nov 2022
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
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
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 10945 approved meteorites (plus 20 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)
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:
  Table 2
  Line 249:
Origin or pseudonym:Main icefield
Mass (g):234.5
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):16
Search for specimens in the Smithsonian Institution collection (U.S.):   
    Require SI photo
Search for this meteorite in the NIPR database (Japan):   
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)
Find references in NASA ADS:
Find references in Google Scholar:

     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page