header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 30 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 A77208
Basic information Name: Allan Hills A77208
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77208
This meteorite may also be called Allan Hills 77208 (ALH 77208) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 1733 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(3)  (1978)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 5782 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 1(3):
This text was reprinted from AMN 1(3) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77208

Location: Allan Hills

Field No.: 77122904

Weight (gms): 1733.0

Meteorite Type: H4 Chondrite

 

Physical Description:

The specimen is angular, highly fractured, and severely weathered. No fusion crust remains on the specimen. The fractures appear to penetrate throughout the stone. Numerous inclusions are visible on the brown weathered surfaces. Approximate dimensions: 13.75x10x9 cm. No fresh metal or unweathered surface was exposed when obtaining material for a thin section.

 

Petrographic Description: Brian Mason

Chondrules are numerous and well-developed, ranging from 0.3 to 0.9 mm in diameter; a variety of types is present, the commonest being granular olivine, porphyritic olivine, and fine-grained or granular pyroxene. Much of the granular pyroxene is polysynthetically twinned clinobronzite. Minor amounts of nickel-iron (~15%) and troilite (~5%) are distributed throughout the groundmass. The meteorite is extensively weathered, with limonite pervading the section and also concentrated in veinlets. Microprobe analyses show olivine (Fa17) and pyroxene (Fs14) of essentially uniform composition. The uniform olivine and pyroxene composition and the presence of clinobronzite indicate that the meteorite should be classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 165:
Origin or pseudonym:Near Western
Mass (g):1733
Class:H4
Weathering grade:C
Fayalite (mol%):17
Ferrosilite (mol%):14
Comments:26Al=52±3; 77004 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 1(3) (1978), 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