|
Allan Hills A78077 | |||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Allan Hills A78077 This is an OFFICIAL meteorite name. Abbreviation: ALHA78077 This meteorite may also be called Allan Hills 78077 (ALH 78077) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 331 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 6484 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(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.: ALHA78077 Location: Allan Hills Field No.: 257 Weight (gms): 330.6 Meteorite Type: H4 Chondrite
Physical Description: A thin, shiny, black fusion crust covers this 6.5 x 6.0 x 5.0 cm. specimen. In spots the fusion crust is weathering away, revealing a smooth brownish-red surface. Several deep cracks penetrate the sample. During processing the sample cleaved along one of these fractures, revealing no unoxidized material.
Petrographic Description: Brian Mason Chondritic structure is well developed, chondrules ranging from 0.3 - 1.5 mm across; the commonest types are porphyritic olivine, granular olivine and olivine-pyroxene, and fine-grained pyroxene. The chondrules are set in a granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Some of the pyroxene is polysynthetically twinned clinobronzite. Limonitic staining pervades the section, and veinlets and patches of red-brown limonite are present. Microprobe analyses show olivine of essentially uniform composition (Fa19) and somewhat variable pyroxene (Fs15-Fs18, mean Fs17). The meteorite is classified as an H4 chondrite. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 309: |
|
||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||
References: | Published in Antarctic Meteorite Newsletter 3(2) (1980), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
| ||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 44400 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
Proximity search: | |||||||||||||||||||||||||
Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
| ||||||||||||||||||||||||
Revision history: |
This lists important revisions made to data for this record.
|