MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 20 Jun 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 A77150
Basic information Name: Allan Hills A77150
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77150
This meteorite may also be called Allan Hills 77150 (ALH 77150) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 58.3 g
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  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 12068 approved meteorites (plus 6 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 4(1):

Sample No.: ALHA77150

Location: Allan Hills

Field No.: 77123101

Weight (gms): 58.30

Meteorite Type: L6 Chondrite


Physical Description:

Maximum dimension of specimen is ~3.25 cm. Fusion crust covers the B and S surfaces, the remainder of the specimen is a fracture surface which is brownish-red. The fracture surface has a fine-grained, granular texture with some crystal faces apparent. The fissures on the fracture surface are iron oxide stained. When chipping, many very fine pieces fell off. The sample appears to be weathered throughout.


Petrographic Description: Brian Mason

Chondrules are sparse-and barely distinguishable from the granular groundmass, which consists of olivine, pyroxene, nickel-iron, and troilite. The section contains a fine-grained enclave, 1.5 mm across, consisting of olivine, pyroxene and numerous minute nickel-iron grains. Yellow-brown limonitic staining is pervasive throughout the meteorite. Microprobe analyses show olivine (Fa25) and orthopyroxene (Fs22) of uniform composition; medium-grained sodic plagioclase was also seen.

Data from:
  Table 2
  Line 118:
Origin or pseudonym:Main icefield
Mass (g):58.3
Weathering grade:C
Fayalite (mol%):25
Ferrosilite (mol%):22
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 4(1) (1981), 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 43352 approved meteorites from Antarctica (plus 3802 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page