| MetSoc Home Publications Contacts |
|
||
|
||
| 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:  48.1 g | ||||||||||||||||||||||||||||
| Classification history: |
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 |
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: |
|
||||||||||||||||||||||||||||
| Catalogs: |
| ||||||||||||||||||||||||||||
| References: | Published in Antarctic Meteorite Newsletter 6(2) (1983), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
| ||||||||||||||||||||||||||||
Geography:
|
Statistics: This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||||||
| Proximity search: | |||||||||||||||||||||||||||||