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Allan Hills A81102
Basic information Name: Allan Hills A81102
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81102
This meteorite may also be called Allan Hills 81102 (ALH 81102) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 196 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(1)  (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 5854 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)
Writeuphelp
Writeup from AMN 6(1):

Sample No.: ALHA81102

Location: Allan Hills

Field No.: 1610

Weight (gms): 196.0

Meteorite Type: H6 Chondrite

 

Physical Description: Carol Schwarz

The specimen has only a thin remnant fusion crust in patches with most of the surface being a dark red-brown color. A few <1 mm chondrules are visible. The interior exposed in chipping is dark red-brown in color. Dimensions: 7.5 x 5 x 3 cm.

 

Petrographic Description: Brian Mason

Chondrules are present, but are extensively integrated with the granular groundmass, which consists largely of olivine and pyroxene with minor amounts of nickel-iron, troilite, and plagioclase. Weathering is extensive, with limonitic staining and small areas of limonite throughout the section. Microprobe analyses give the following compositions: olivine, Fa19; orthopyroxene, Fs17; plagioclase, An12. The meteorite is an H6 chondrite.

Data from:
  MB76
  Table 2
  Line 625:
Origin or pseudonym:Main icefield
Mass (g):196
Class:H6
Weathering grade:B/C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=36±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° 41' 55"S, 159° 23' 45"E)
Note: the NHM and MetBase coordinates are 7.2 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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