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Allan Hills A79023
Basic information Name: Allan Hills A79023
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79023
This meteorite may also be called Allan Hills 79023 (ALH 79023) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 68.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th 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 4(1):

Sample No.: ALHA79023

Location: Allan Hills

Field No.: 1157

Weight (gms): 68.1

Meteorite Type: H4 Chondrite

 

Physical Description: Roberta Score

This flat sample has one small patch of weathered fusion crust. The rest of the stone is iridescent reddish-brown in color. Several cracks penetrate the interior. Upon chipping, the meteorite fell into many small pieces. 90% of the interior is weathered, 10% is medium gray in color with many inclusions and oxidation haloes scattered throughout. The chip for thin section was taken from the freshest material. Dimensions: 5 x 4 x 1.5 cm.

 

Petrographic Description: Brian Mason

The section shows numerous chondrules and chondrule fragments, 0.2-1.8 mm across. They are set in a granular groundmass which consists largely of olivine and pyroxene with minor amounts of nickel-iron and troilite. Weathering is extensive, shown by limonitic stains and veining throughout the section. Microprobe analyses show olivine of essentially uniform composition (Fa17) and somewhat variable pyroxene (Fs14-17 , average Fs15). The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 461:
Origin or pseudonym:Main icefield
Mass (g):68.1
Class:H4
Weathering grade:B/C
Fayalite (mol%):17
Ferrosilite (mol%):14-17
Comments:26Al=33±5
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 4(1) (1981), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 42' 11"S, 159° 23' 34"E)
Note: the NHM and MetBase coordinates are 7.2 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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