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Allan Hills A81039
Basic information Name: Allan Hills A81039
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81039
This meteorite may also be called Allan Hills 81039 (ALH 81039) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 206 g
Classification
  history:
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 9995 approved meteorites (plus 16 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)
Writeuphelp
Writeup from AMN 6(1):

Sample No.: ALHA81039

Location: Allan Hills

Field No.: 1495

Weight (gms): 205.9

Meteorite Type: H5 Chondrite

Physical Description: Carol Schwarz

This specimen consists of two pieces which fit together plus a small (~1.5 cm) piece. The two larger pieces have black pitted fusion crust on all sides but one. The small piece is nearly totally covered with fusion crust. Chipping revealed a light gray matrix with oxidation haloes. A weathering rind has formed along the face where fusion crust is absent. Dimensions: 10 x 4.5 x 4 cm.

 

Petrographic Description: Brian Mason

Chondrules are present, but are poorly defined, their margins tending to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Minor weathering is indicated by brown limonitic staining concentrated around metal grains. Microprobe analyses give the following compositions: olivine, Fa19; orthopyroxene, Fs17. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 562:
Origin or pseudonym:Main icefield
Mass (g):205.9
Class:H5
Weathering grade:A/B
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=56±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' 36"S, 159° 11' 0"E)
Note: the NHM and MetBase coordinates are 12.7 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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