MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 3 Jun 2023
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 A78103
Basic information Name: Allan Hills A78103
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78103
This meteorite may also be called Allan Hills 78103 (ALH 78103) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 590 g
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
NIPR Catalogue:  2000 Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 12331 approved meteorites (plus 8 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
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.: ALHA78103

Location: Allan Hills

Field No.: 243

Weight (gms): 589.7

Meteorite Type: L6 Chondrite


Physical Description:

The rounded specimen is approximately 11 x 7 x 4 cm.. The entire sample, with possible exception of a small patch of remnant fusion crust on the E surface, is weathered and stained by iron-oxidation. The B surface is the less severely weathered of all the surfaces, and several chondrules, 3-5 mm in diameter, are apparent. The matrix of the sample is greenish-gray. Several fractures are present on the T surface. The sample broke along at fracture during processing of the meteorite. Some oxidation halos, and some metallic flakes are visible in the greenish gray matrix of the sample, The sample appears to have a weathering rind, ~3 mm. in depth, along the T surface. The sample cannot be magnetically orientated.


Petrographic Description: Brian Mason

Chondrules are sparse and have diffuse margins which tend to merge with the granular matrix, which consists of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, some plagioclase,- and accessory chromite. Minor limonitic staining is present around nickel-iron grains. Well-preserved fusion crust, 0.5 mm thick, is present along one edge. Microprobe analyses give the following compositions: olivine, Fa24; pyroxene, Fs20; plagioclase, An 10. The meteorite is an L6 chondrite. ALHA78103 is an L6 chondrite similar to ALHA78104 in all respects.

Data from:
  Table 2
  Line 327:
Origin or pseudonym:Main icefield
Mass (g):589.7
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:26Al=58±3; 78103 pairing group
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 3(1) (1980), 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 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page