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Allan Hills A81042
Basic information Name: Allan Hills A81042
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81042
This meteorite may also be called Allan Hills 81042 (ALH 81042) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 534 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 10004 approved meteorites (plus 17 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 6(1):

Sample No.: ALHA81042

Location: Allan Hills

Field No.: 1640

Weight (gms): 534.4

Meteorite Type: H5 Chondrite

 

Physical Description: Carol Schwarz

This specimen has patchy fusion crust on its shiny red-brown exterior. It is extensively fractured. The interior appears to be totally weathered. Dimensions: 10 x 7 x 5 cm.

 

Petrographic Description: Brian Mason

Chondrules are fairly abundant, but their margins are diffuse, tending to merge with the granular groundmass, which consists largely of olivine and pyroxene with minor amounts of nickel-iron and troilite. Weathering is extensive, with brown limonitic staining and veinlets throughout the section. Microprobe analyses give the following compositions: olivine, Fa19; orthopyroxene, Fs17. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 565:
Origin or pseudonym:Near Western
Mass (g):534.4
Class:H5
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=50±2
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 6(1) (1983), 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° 43' 20"S, 158° 45' 47"E)
Note: the NHM and MetBase coordinates are 23.2 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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