header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 20 Oct 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 A78075
Basic information Name: Allan Hills A78075
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78075
This meteorite may also be called Allan Hills 78075 (ALH 78075) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 281 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  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 9646 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 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78075

Location: Allan Hills

Field No.: 253

Weight (gms): 280.6

Meteorite Type: H5 Chondrite

 

Physical Description:

A thin, shiny fusion crust covers most of this specimen (7 x 6 x 3 cm), with the exception of portions of the T and W faces. The surfaces devoid of fusion crust are smooth and weathered to a shiny dark reddish-brown. Several non-penetrating fractures are present on the sample. Light colored inclusions and metal fragments are apparent in the dark matrix material of the sample.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, with chondrules ranging from 0.2-1.5 mm across; they include a variety of types, the commonest being porphyritic olivine, granular olivine, and fibrous radiating pyroxene. The groundmass consists largely of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Brown limonitic staining pervades the section and some veinlets and patches of red-brown limonite are present. Microprobe analyses give the following compositions: olivine, Fa18, pyroxene, Fs16. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 307:
Origin or pseudonym:Main icefield
Mass (g):280.6
Class:H5
Weathering grade:B/C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=49±3
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 3(2) (1980), 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