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Allan Hills A78076 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills A78076 This is an OFFICIAL meteorite name. Abbreviation: ALHA78076 This meteorite may also be called Allan Hills 78076 (ALH 78076) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 276 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 6775 approved meteorites (plus 6 unapproved names) classified as H6. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||
Writeup |
Writeup from AMN 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA78076 Location: Allan Hills Field No.: 252 Weight (gms): 275.6 Meteorite Type: H6 Chondrite
Physical Description: A thin (< 1 mm. ) black fusion crust covers most of the sample (8.0 x 5.0 x 4.5 cm). Some small areas of the fusion crust have been physically removed and other areas are stained reddish by iron-oxidation. Polygonal fractures are present on the T and N surfaces. In areas where the fusion crust is absent, clasts of 1-2 mm are apparent in the oxidized material. When the sample was cleaved, clasts as much as 3 mm. in diameter were exposed in the grayish matrix material. The sample is friable and only minor amounts of iron-oxidation are apparent surrounding metallic flakes.
Petrographic Description: Brian Mason Chondrules are present, but are poorly defined and tend to merge with the granular groundmass, which consists of olivine and pyroxene, with minor amounts of nickel-iron and troilite, and a little plagioclase. A rounded aggregate of closely packed chromite grains with interstitial plagioclase, possibly a chondrule, was noted. Minor limonitic staining is present, concentrated around, the nickel-iron grains. Microprobe analyses give the following compositions: olivine, Fa18; pyroxene, Fs16; plagioclase, An 13. The meteorite is an H6 chondrite. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 308: |
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Catalogs: |
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References: | Published in Antarctic Meteorite Newsletter 3(2) (1980), 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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