header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 16 Nov 2019
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Allan Hills A77061
Basic information Name: Allan Hills A77061
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77061
This meteorite may also be called Allan Hills 77061 (ALH 77061) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 12.6 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
NIPR Catalogue:  2000 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 4(1):

Sample No.: ALHA77061

Location: Allan Nil

Field No.: 77122789

Weight (gms): 12.61

Meteorite Type: H5 Chondrite

 

Physical Description:

Approximately one-half of the specimen's surface is covered by a thin, brownish-black fusion crust. The other half of the specimen is a light-to-medium fracture surface with appreciable iron oxide staining. Chondrules appear present on fractured surface, however, they are not prominent. This is not a complete stone. From field photographs it is apparent that the B surface was in contact with the ice. Maximum dimension is approximately 2.5 cm.

 

Petrographic Description: Brian Mason

Chondrules numerous but poorly defined, their margins merging with the granular groundmass; a variety of types is present, including porphyritic olivine, barred olivine, radiating pyroxene, and others. Fusion crust is present on one edge. The section is pervaded with a moderate amount of yellow-brown limonitic staining, concentrated around grains of nickel-iron; occasional discrete patch brown limonite are present. Microprobe analyses show uniform olivine (Fa18) and orthopyroxene (Fs17) compositions; some small grains of sodic plagioclase were also detected.

Data from:
  MB76
  Table 2
  Line 55:
Origin or pseudonym:Main icefield
Mass (g):12.6
Class:H5
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):17
Comments:77021 pairing group
Catalogs:
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:
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)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page