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Allan Hills A81103
Basic information Name: Allan Hills A81103
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81103
This meteorite may also be called Allan Hills 81103 (ALH 81103) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 136.1 g
Antarctic Meteorite Newsletter:  AMN 6(2)  (1983)  H6
Meteoritical Bulletin:  MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 6364 approved meteorites (plus 5 unapproved names) classified as H6.   [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.: ALHA81103

Location: Allan Hills

Field No.: 1426

Weight (gms): 136.1

Meteorite Type: H6 Chondrite


Physical Description: Carol Schwarz

The fusion crust on this stone is fractured and blistery in some areas. The other surfaces are brown and somewhat vuggy. The interior is reddish brown with one small area of grayish matrix remaining. Dimensions: 6 x 5 x 3 cm


Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined,. their margins merging with the groundmass, which consists largely of granular olivine and pyroxene, with minor amounts of nickel-iron, troilite, and plagioclase. Weathering is extensive, with veinlets and small areas of brown limonite throughout. Microprobe analyses gave the following compositions: olivine, Fa19; orthopyroxene Fs17; plagioclase, An12. The meteorite is an H6 chondrite; it is very similar to ALHA81112, and is possibly paired with that specimen.

Data from:
  Table 2
  Line 626:
Origin or pseudonym:Middle Western
Mass (g):136.1
Weathering grade:B/C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=49±2; 81035 pairing group
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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° 49' 30"S, 158° 12' 29"E)
Note: the NHM and MetBase coordinates are 39.2 km apart

     This is 1 of 43332 approved meteorites from Antarctica (plus 3802 unapproved names)
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