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Allan Hills 82102
Basic information Name: Allan Hills 82102
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 82102
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 48.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(2)  (1983)  OC
AMN 7(1)  (1984)  OC in ice
AMN 7(2)  (1984)  H5 (in ice)
Meteoritical Bulletin:  MB 76  (1994)  H5 in ice
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 9655 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(2):

Sample No.: ALHA82102

Location: Allan Hills

Field No.: 2995

Weight (gms): 40 (estimate)

Meteorite Type: Ordinary Chondrite

 

Physical Description: Roberta Score

Stone was found apparently weathering out of the ice at the Far Western Ice Field. This specimen was collected in situ in a large block of encasing ice. The ice was sent to an ice coring lab in New Hampshire and was determined to be original (not refrozen) ice. The meteorite is now being sent back to Houston for characterization.


[From AMN 7(2):]

Sample No.: ALH82102

Location: Allan Hills

Field No.: 2995

Weight (gms): 48.0

Meteorite Type: H5 Chondrite

Physical Description: Roberta Score

The stone was found apparently weathering out of the ice at the Far Western Ice Field. This specimen was collected in situ in a large block of encasing ice. The ice block was sent to an ice coring lab in New Hampshire and was determined to be original (not refrozen) ice. Extreme care was taken to preserve the orientation of both the ice and meteorite. Allocations of both are available. The dull, black polygonally fractured fusion crust contains many centimeter-sized, highly oxidized halos that are orangish-red in color. One fracture surface contains a small amount of fusion crust but is generally a reddish-brown color. The interior of this meteorite is evenly weathered with only a small area of unweathered material remaining. A couple of minor fractures are present. Dimensions: 3 x 4 x 4 cm

Petrographic Description: Brian Mason

Chondrules are fairly abundant, ranging up to 2 mm in diameter; they are set in a groundmass of fine-grained olivine and pyroxene with minor amounts of coarser-grained nickel-iron and troilite. Some weathering is indicated by brown limonitic staining, concentrated around metal grains. Microprobe analyses give the following compositions: olivine, Fa18; pyroxene, Fs16. The meteorite is an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 841:
Origin or pseudonym:Far Western
Mass (g):48.1
Class:H5 in ice
Weathering grade:B/C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=39±2
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (77° 2' 48"S, 157° 14' 39"E)
Note: the NHM and MetBase coordinates are 71.6 km apart

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