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 A77190
Basic information Name: Allan Hills A77190
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77190
This meteorite may also be called Allan Hills 77190 (ALH 77190) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 387 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  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 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.: ALHA77190

Location: Allan Hills

Field No.: 77122915

Weight (gms): 387.1

Meteorite Type: H4 Chondrite

 

Physical Description:

The specimen is approximately 11.0x6.0x4.5 cm and is tabular. The N, T, and S surfaces have patchy remnants of thin, dull, black fusion crust. The E surface is highly oxidized, reddish-brown, fracture surface. The B surface is also a broken surface that is light brown. No unweathered material was exposed on the meteorite when it was cleaved in half. The sample is uniform reddish-brown throughout. After drying in the nitrogen cabinet for forth-eight hours, a small area of white material, presumably evaporites, developed on the freshly exposed interior surface.

 

Petrographic Description: Brian Mason

The section shows well-developed chondritic structure, but many chondrules appear to be partly fragmented (possibly shock-induced) and tend to merge with granular groundmass, which consists of olivine and pyroxene with minor amounts of nickel-iron and troilite. One large area of nickel-iron, 6x3 mm, was noted. The meteorite is severely weathered, with limonite veins throughout the section. Microprobe analyses show olivine with slightly variable composition (Fa17-19, average Fa18) and pyroxene with greater variability (Fs15-22, average Fs17). Accessory merrillite was identified with the microprobe. The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 153:
Origin or pseudonym:Near Western
Mass (g):387.1
Class:H4
Weathering grade:C
Fayalite (mol%):17-19
Ferrosilite (mol%):15-22
Comments:26Al=51±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 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:
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