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| Allan Hills A79039 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A79039 This is an OFFICIAL meteorite name. Abbreviation: ALHA79039 This meteorite may also be called Allan Hills 79039 (ALH 79039) in publications. Observed fall: No Year found: 1979 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  108.3 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 6412 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 4(1):
Sample No.: ALHA79039 Location: Allan Hills Field No.: 1059 Weight (gms): 108.3 Meteorite Type: H4 Chondrite
Physical Description: Roberta Score The top of this stone is concave while the bottom is flat. ALHA79039 is totally covered with a thin black fusion crust which the bottom surface has a blistery texture. Several fractures penetrate the, interior of this meteorite. The interior material is mainly weathered though areas of light gray clastic material do exist. Dimensions: 6 x 5 x 2.5 cm.
Petrographic Description: Brian Mason Chondrules are abundant and well-developed, ranging from 0.3-1.5 mm in diameter. A variety of types is present, including granular and porphyritic olivine, barred olivine, and fine-grained radiating pyroxene. The groundmass consists largely of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite. Some of the pyroxene is polysynthetically-twinned clinobronzite. Brown limonitic staining pervades the section. Fusion crust, up to 1 mm thick, rims part of the section. Microprobe analyses show olivine (Fa16) and pyroxene (Fs15) of essentially uniform composition. The meteorite is classified as an H4 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 476: |
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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 43856 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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