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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:help 331 g
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 6399 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 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:
  Table 2
  Line 309:
Origin or pseudonym:Main icefield
Mass (g):330.6
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):15-18
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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