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| Allan Hills A78111 | |||||||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A78111 This is an OFFICIAL meteorite name. Abbreviation: ALHA78111 This meteorite may also be called Allan Hills 78111 (ALH 78111) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  126.8 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 10193 approved meteorites (plus 18 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(2):
Sample No.: ALHA78111 Location: Allan Hills Field No.: 472 Weight (gms): 126.8 Meteorite Type: H5 Chondrite
Physical Description,: Sample is wedge-shaped and has fusion crust along one edge. Remainder of sample may or may not have remnant fusion crust. One surface contains many chondrules which could be plucked out. Only a small area (0.6 cm) through the center of the stone is unweathered. The unweathered matrix is light gray in color. Some fresh metal is visible. When the meteorite was chipped, it broke into many pieces. Dimensions: 7.5 x 5.5 x 2 cm.
Petrographic Description: Brian Mason The section shows well-developed chondritic structure, chondrules ranging from 0.3-1.2 mm across. Chondrule margins are sometimes diffuse, tending to merge with the granular groundmass, which consists largely of olivine end pyroxene, with minor amounts of nickel-iron and troilite and a little fine-grained plagioclase. The meteorite is somewhat weathered, with veins and patches of brown limonite throughout the section. Microprobe analyses gave the following compositions: olivine. Fa18; pyroxene, Fs16; plagioclase, An13. The meteorite is classified as an H5 chondrite. | ||||||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 335: |
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| References: | Published in Antarctic Meteorite Newsletter 4(2) (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 40719 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||||||||||
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