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| Allan Hills A77061 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A77061 This is an OFFICIAL meteorite name. Abbreviation: ALHA77061 This meteorite may also be called Allan Hills 77061 (ALH 77061) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  12.6 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 10851 approved meteorites (plus 19 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 4(1):
Sample No.: ALHA77061 Location: Allan Nil Field No.: 77122789 Weight (gms): 12.61 Meteorite Type: H5 Chondrite
Physical Description: Approximately one-half of the specimen's surface is covered by a thin, brownish-black fusion crust. The other half of the specimen is a light-to-medium fracture surface with appreciable iron oxide staining. Chondrules appear present on fractured surface, however, they are not prominent. This is not a complete stone. From field photographs it is apparent that the B surface was in contact with the ice. Maximum dimension is approximately 2.5 cm.
Petrographic Description: Brian Mason Chondrules numerous but poorly defined, their margins merging with the granular groundmass; a variety of types is present, including porphyritic olivine, barred olivine, radiating pyroxene, and others. Fusion crust is present on one edge. The section is pervaded with a moderate amount of yellow-brown limonitic staining, concentrated around grains of nickel-iron; occasional discrete patch brown limonite are present. Microprobe analyses show uniform olivine (Fa18) and orthopyroxene (Fs17) compositions; some small grains of sodic plagioclase were also detected. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 55: |
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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:
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Statistics: This is 1 of 43332 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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