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Allan Hills A81064
Basic information Name: Allan Hills A81064
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81064
This meteorite may also be called Allan Hills 81064 (ALH 81064) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 191 g
Antarctic Meteorite Newsletter:  AMN 6(2)  (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 11150 approved meteorites (plus 22 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)
Writeup from AMN 6(2):

Sample No.: ALHA81064

Location: Allan Hills

Field No.: 1135, 1139

Weight (gms): 191.0

Meteorite Type: H5 Chondrite


Physical Description: Roberta Score

ALRA8104 consists of two pieces that fit together perfectly. Patches of black fusion crust are present on the exterior, with the rest of the stone being a uniform reddish-brown color. The interior is extensively weathered. Dimensions: 7.5 x 4 x 2 cm


Petrographic Description: Brian Mason

Chondrules are fairly abundant, but their margins are sometimes diffuse and tend to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Weathering is extensive, with limonitic staining throughout the section and some small areas of brown limonite. Microprobe analyses gave the following compositions: olivine, Fa18; pyroxene, Fs15 . The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 587:
Origin or pseudonym:Main icefield
Mass (g):191
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):15
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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° 41' 36"S, 159° 22' 59"E)
Note: the NHM and MetBase coordinates are 7.7 km apart

     This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
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