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Allan Hills A81112
Basic information Name: Allan Hills A81112
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81112
This meteorite may also be called Allan Hills 81112 (ALH 81112) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 150.3 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.: ALHA81112

Location: Allan Hills

Field No.: 1550

Weight (gms): 150.3

Meteorite Type: H6 Chondrite

Physical Description: Carol Schwarz

Dull black fusion crust covers most of this sample. The other surfaces are dark brown with several light inclusions visible. The interior exposed in chipping is a red brown color. Dimensions: 5 x 5 x 3.5 cm

Petrographic Description: Brian Mason

The section shows a granular aggregate of olivine and pyroxene, with minor amounts of nickel-iron, troilite, and plagioclase, with a few poorly defined chondrules. Weathering is extensive, with veins and small areas of brown limonite throughout. Remnants of fusion crust, up to 0.5 mm thick, rim the section. Microprobe analyses gave the following results: olivine, Fa19; orthopyroxene, Fs17; plagioclase, An12. The meteorite is an H6 chondrite.

Data from:
  Table 2
  Line 635:
Origin or pseudonym:Main icefield
Mass (g):150.3
Weathering grade:B/C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=39±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° 40' 52"S, 159° 15' 55"E)
Note: the NHM and MetBase coordinates are 11 km apart

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