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Allan Hills A79027 | |||||||||||||||||||||
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Basic information | Name: Allan Hills A79027 This is an OFFICIAL meteorite name. Abbreviation: ALHA79027 This meteorite may also be called Allan Hills 79027 (ALH 79027) in publications. Observed fall: No Year found: 1979 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 133.2 g | ||||||||||||||||||||
Classification history: |
This is 1 of 12727 approved meteorites (plus 11 unapproved names) classified as L6. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
Writeup |
Writeup from AMN 4(1):
Sample No.: ALHA79027 Location: Allan Hills Field No.: 1156 Weight (gms): 133.2 Meteorite Type: L6 Chondrite
Physical Description: Roberta Score This stone looks as though it may fit together with ALHA79018 to make one stone. Dull black fusion crust covers five surfaces. Patches of fusion crust exist on the fracture surface indicating that this stone broke during entry in the atmosphere. The fracture surface ranges from yellowish-green to red-brown in color. Many inclusions are visible, the largest is 4 mm in its longest dimension (which looks similar to a inclusion in ALHA79018). The interior is light gray in color with reddish-brown oxidation scattered throughout. A 2 mm thick weathering rind is visible. Dimensions: 5.5 x 4.5 x 3 cm.
Petrographic Description: Brian Mason Chondrules are barely discernible, merging with the granular matrix which consist largely of olivine and pyroxene, with minor plagioclase, nickel-iron, and troilite. Fusion crust, up to 0.6 mm thick, rims part of the section. The meteorite is almost unweathered, with only traces of limonitic alteration around the nickel-iron grains. Microprobe analyses gave the following compositions: olivine, Fa24; pyroxene, Fs20; plagioclase, An10. The meteorite is classified as an L6 chondrite. | ||||||||||||||||||||
Data from: MB76 Table 2 Line 465: |
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Catalogs: |
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References: | Published in Antarctic Meteorite Newsletter 4(1) (1981), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography: |
Statistics: This is 1 of 44400 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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Revision history: |
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