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| Allan Hills A77010 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A77010 This is an OFFICIAL meteorite name. Abbreviation: ALHA77010 This meteorite may also be called Allan Hills 77010 (ALH 77010) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  296 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 6426 approved meteorites (plus 2 unapproved names) classified as H4. [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(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA77010 Location: Allan Hills Field No.: 77122939 Weight (gms): 295.8 Meteorite Type: H4 Chondrite
Physical Description: The exterior of the specimen is nearly a uniform reddish-brown. However, a small amount of thin, black fusion crust is present on the E surface. Several rounded (chondrules) and angular (lithic clasts) inclusions are apparent on the sawed surfaces. The inclusions are lighter in color than the reddish-brown, iron oxide stained matrix material. Dimensions: 7.0x5.0x5.0 cm.
Petrographic Description: Brian Mason Chondrules are prominent and well developed, 0.2-1.5 mm in diameter; a variety of types is present, the commonest being porphyritic olivine, granular olivine-pyroxene, and fine-grained pyroxene. Pyroxene grains in the olivine-pyroxene chondrules are polysynthetically twinned clinobronzite. The groundmass consists of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite. The section shows a considerable degree of weathering in the form of small areas and veinlets of brown limonite. Microprobe analyses show olivine of essentially uniform composition (Fa18) and pyroxene of somewhat variable composition (Fs15-Fs18, average Fs16). The meteorite is classified as an H4 chondrite. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 18: |
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| References: | Published in Antarctic Meteorite Newsletter 3(1) (1980), 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 43857 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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