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Allan Hills A81104
Basic information Name: Allan Hills A81104
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81104
This meteorite may also be called Allan Hills 81104 (ALH 81104) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 183.8 g
Antarctic Meteorite Newsletter:  AMN 6(2)  (1983)  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 6313 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)
Writeup from AMN 6(2):

Sample No.: ALHA81104

Location: Allan Hills

Field No.: 1114

Weight (gms): 183.8

Meteorite Type: H4 Chondrite


Physical Description: Carol Schwarz

Thin patchy fusion crust occurs on several sides of this reddish brown fragment. It is extremely fractured. The interior is totally weathered. Dimensions: 9 x 4.5 x 3.5 cm


Petrographic Description: Brian Mason

Chondrules are numerous and well developed, but some are deformed or fragmented. They are set in a granular groundmass consisting largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Much of the pyroxene is polysynthetically twinned clinobronzite. Weathering is indicated by brown limonitic staining throughout the section. Microprobe analyses gave the following compositions: olivine, Fa19; pyroxene, Fs17. The meteorite is classified as an H4 chondrite.

Data from:
  Table 2
  Line 627:
Origin or pseudonym:Near Western
Mass (g):183.8
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):17
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References: Published in Antarctic Meteorite Newsletter 6(2) (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° 42' 58"S, 158° 44' 48"E)
Note: the NHM and MetBase coordinates are 23.6 km apart

     This is 1 of 43331 approved meteorites from Antarctica (plus 3802 unapproved names)
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