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Allan Hills A81019
Basic information Name: Allan Hills A81019
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81019
This meteorite may also be called Allan Hills 81019 (ALH 81019) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1051 g
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 10945 approved meteorites (plus 20 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)
Writeup from AMN 6(1):

Sample No.: ALHA81019

Location: Allan Hills

Field No.: 1428

Weight (gms): 1051.2

Meteorite Type: H5 Chondrite


Physical Description: Carol Schwarz

This specimen is rectangular shaped with thin patchy black fusion crust covering about 65% of its surface. Where the fusion crust is absent the surface is smooth and reddish-brown in color with no features distinguishable. There is a deep fracture penetrating the stone, dividing it into two halves. A small amount of white deposit has formed on the top surface. The interior is dark reddish-brown with several small areas which are not completely weathered. Dimensions: 9 x 7 x 6.5 cm.


Petrographic Description: Brian Mason

Chondrules are present but are poorly defined, their margins merging with the granular groundmass, which consists largely of olivine and pyroxene with minor amounts of nickel-iron and troilite. Patchy brown limonitic staining is present throughout the section. Microprobe analyses give the following compositions: olivine, Fa19; orthopyroxene, Fs16. The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 542:
Origin or pseudonym:Middle Western
Mass (g):1051.2
Weathering grade:B/Ce
Fayalite (mol%):19
Ferrosilite (mol%):16
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 49' 39"S, 158° 12' 40"E)
Note: the NHM and MetBase coordinates are 39.2 km apart

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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